Intermetallics最新文献_第4页

Achieving improved wear resistance and balanced strength-ductility in laser powder bed fused Al0.3CoCrFeNi alloy via L12 precipitation 通过L12析出，提高了Al0.3CoCrFeNi激光粉末床熔敷合金的耐磨性和强度-塑性平衡

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-04-01 Epub Date: 2026-02-03 DOI: 10.1016/j.intermet.2026.109171

Shaopeng Liu , Xiaobo Li , Zhipeng Ge , Han Zhang , Qiang Hu , Huoping Zhao , Mingxue Shen

{"title":"Achieving improved wear resistance and balanced strength-ductility in laser powder bed fused Al0.3CoCrFeNi alloy via L12 precipitation","authors":"Shaopeng Liu , Xiaobo Li , Zhipeng Ge , Han Zhang , Qiang Hu , Huoping Zhao , Mingxue Shen","doi":"10.1016/j.intermet.2026.109171","DOIUrl":"10.1016/j.intermet.2026.109171","url":null,"abstract":"<div><div>Synergistically enhancing the strength, ductility, and wear resistance of LPBF-fabricated Al<sub>0.3</sub>CoCrFeNi alloy is critical for advancing its industrial applications. In this study, the effect of nano-scale precipitates, generated through annealing at 550 °C for durations ranging from 25 to 300 h, on the mechanical and tribological properties was systematically investigated. The as-fabricated alloy featured cellular structures with an average cell size of approximately 0.53 μm. Low-temperature annealing promoted the formation of spherical L1<sub>2</sub> precipitates, which had an average size of 1.85 ± 0.76 nm. These precipitates effectively accommodated and impeded dislocation motion, enabling an excellent combination of mechanical properties, including a tensile strength of 973.3 ± 15.6 MPa and an elongation of 20.6 %. Compared to the as-printed sample, the annealed material exhibits a 25.3 % increase in tensile strength and a 32.9 % improvement in elongation. After 150 h of annealing, the wear rate decreased to 0.798 × 10<sup>−4</sup> mm<sup>3</sup>/N·m, representing a 30.8 % reduction compared to the as-printed sample. This enhancement in wear resistance primarily originates from the role of the L1<sub>2</sub> precipitates in facilitating the formation of a dense, protective oxide layer that exhibits both anti-wear and self-lubricating properties.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"191 ","pages":"Article 109171"},"PeriodicalIF":4.8,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engineering ultra-low friction via structural relaxation in Ni55Ti45 ultra thin amorphous films 利用Ni55Ti45超薄非晶薄膜的结构松弛实现工程超低摩擦

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-04-01 Epub Date: 2026-02-04 DOI: 10.1016/j.intermet.2026.109182

Qunfeng Zeng, Wanjun He

{"title":"Engineering ultra-low friction via structural relaxation in Ni55Ti45 ultra thin amorphous films","authors":"Qunfeng Zeng, Wanjun He","doi":"10.1016/j.intermet.2026.109182","DOIUrl":"10.1016/j.intermet.2026.109182","url":null,"abstract":"<div><div>This study investigates the effect of thermal annealing on the nano-mechanical and nano-tribological properties of sputter-deposited Ni<sub>55</sub>Ti<sub>45</sub> ultrathin films (∼180 nm). Annealing at 350 °C induces structural relaxation, leading to the in-plane film shrinkage due to densification and an increase in surface roughness, driven by the formation of dominant hillock features. The short-range ordered domain in the film is formed and expanded. These structural changes yield an improvement in hardness and enhancement in elastic recovery compared to the as-deposited state. The as-deposited film and structurally relaxed film have amorphous structure, but only the structurally relaxed film can take full advantage of amorphous structure's inherent properties. The structurally relaxed Ni<sub>55</sub>Ti<sub>45</sub> ultrathin film has the enhanced nano-tribological performance. Crucially, the annealed Ni<sub>55</sub>Ti<sub>45</sub> ultrathin film at 350 °C for 1 h exhibits superior tribological performance, achieving a coefficient of friction (COF) as low as ∼0.09 without lubrication. The results establish a direct link between thermally engineered surface topography and enhanced functional properties, demonstrating a promising route for optimizing wear-resistant nanoscale coatings.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"191 ","pages":"Article 109182"},"PeriodicalIF":4.8,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure, mechanical properties, wear, and corrosion resistance of as-cast VZrTa0.5Tix refractory medium-entropy alloys 铸态VZrTa0.5Tix难熔中熵合金的组织、力学性能、磨损及耐蚀性

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-04-01 Epub Date: 2026-01-23 DOI: 10.1016/j.intermet.2026.109175

Peihao zhang , Xinmei Li , Aixiang Zhang , Liping Wu , Yangxuan Xie

{"title":"Microstructure, mechanical properties, wear, and corrosion resistance of as-cast VZrTa0.5Tix refractory medium-entropy alloys","authors":"Peihao zhang , Xinmei Li , Aixiang Zhang , Liping Wu , Yangxuan Xie","doi":"10.1016/j.intermet.2026.109175","DOIUrl":"10.1016/j.intermet.2026.109175","url":null,"abstract":"<div><div>This study fabricated a series of VZrTa<sub>0.5</sub>Ti<sub>x</sub> (molar ratio, x = 0.25, 0.5, 0.75, 1, 1.25) refractory medium-entropy alloys (RMEAs) using vacuum arc melting technology. It systematically investigated the comprehensive effects of Titanium content variation on the alloys' microstructure, mechanical properties, wear resistance, and electrochemical corrosion behaviors. Microstructural analysis reveals that while the addition of Ti effectively suppresses the precipitation of brittle intermetallic compound (IMC) phases, excessive Ti promotes the formation of Ti<sub>3</sub>V IMC phases. Consequently, as Ti content increases, hardness initially decreases before rising to a maximum of 549.5 HV in the Ti1.25 composition, whereas plasticity shows an inverse trend. Notably, the Ti0.25 alloy exhibits the highest yield strength of 2108.2 MPa, while the Ti1 alloy achieves optimal plasticity at 18.3 %. Room temperature dry wear tests showed that the Ti1.25 alloy possesses the lowest friction coefficient (0.473) and wear rate (2.9 × 10<sup>−4</sup> mm<sup>3</sup>/N·m). Furthermore, electrochemical tests in 3.5 % NaCl solution establish that the Ti1 alloy displays superior corrosion resistance. Ultimately, the Ti1 alloy offers a balance of plasticity and corrosion resistance, while Ti1.25 excels in strength and wear resistance, indicating significant engineering potential.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"191 ","pages":"Article 109175"},"PeriodicalIF":4.8,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146015845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of Ta segregation on the corrosion resistance of the Fe30Ni30Cr30Al10-xTax high entropy alloys in lead-bismuth eutectic at 800 °C 在800℃铅铋共晶中，Ta偏析对Fe30Ni30Cr30Al10-xTax高熵合金耐蚀性的影响

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-03-01 Epub Date: 2026-01-21 DOI: 10.1016/j.intermet.2026.109170

Weibing Wang , Wu Kai , Tao Yang , Da Chen , Jixun Zhang , Junhua Luan , Chin-Hua Yang , Bo Wang , Meng Zhang , Ji-jung Kai

{"title":"The effect of Ta segregation on the corrosion resistance of the Fe30Ni30Cr30Al10-xTax high entropy alloys in lead-bismuth eutectic at 800 °C","authors":"Weibing Wang , Wu Kai , Tao Yang , Da Chen , Jixun Zhang , Junhua Luan , Chin-Hua Yang , Bo Wang , Meng Zhang , Ji-jung Kai","doi":"10.1016/j.intermet.2026.109170","DOIUrl":"10.1016/j.intermet.2026.109170","url":null,"abstract":"<div><div>Lead-bismuth eutectic (LBE)-cooled reactors were considered promising candidates for Generation IV nuclear reactor systems due to the favorable physical properties and exceptional safety performance of LBE. This study investigated the role of Ta in enhancing the corrosion resistance of Fe<sub>30</sub>Ni<sub>30</sub>Cr<sub>30</sub>Al<sub>10-x</sub>Ta<sub>x</sub> high-entropy alloys (HEAs) exposed to static LBE at 800 °C. Multiscale characterization revealed that Ta-free HEA (0Ta-HEA) formed an outer FeCr<sub>2</sub>O<sub>4</sub> spinel layer, which permitted significant LBE penetration and inward diffusion of oxygen within the first 48h. In contrast, the 2 at.% (in atomic percent) Ta HEA (2Ta-HEA) exhibited superior corrosion resistance, with corrosion depth reduced by ∼40 %. The low solubility of Ta in LBE led to its rapid saturation and local precipitation, which, in turn, formed protective phases comprising a mixed layer of Al<sub>2</sub>O<sub>3</sub>, Cr-rich phase, and FeCr phase. After 168 h of exposure, the competitive mechanism between dissolution and oxidation dominated in the 2Ta-HEA. The mixed layer formed during the initial stage of corrosion gradually evolved into a double-layered scale, consisting of an outer Ta-rich LBE layer and an inner layer of Cr<sub>2</sub>O<sub>3</sub> and FeCr<sub>2</sub>O<sub>4</sub>. The discontinuous Al<sub>2</sub>O<sub>3</sub> only inhibited the penetration of LBE at the initial stage of corrosion. These findings highlighted Ta as a strategic alloying element for mitigating LBE corrosion in nuclear applications, stabilizing interfaces, and minimizing elemental loss.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"190 ","pages":"Article 109170"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic strengthening and microstructure evolution of laser-cladded CoCrFeNiWx high-entropy alloy coatings with enhanced thermal fatigue and wear resistance 激光熔覆CoCrFeNiWx高熵合金涂层的协同强化和显微组织演变

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-03-01 Epub Date: 2026-01-08 DOI: 10.1016/j.intermet.2025.109142

Taiqing Li , Qi Sui , Jianbin Zhang , Ying Han , Xiaolei Song , Xu Ran , Bingrun Yang , Shuai Wang , Shiyu He , Xianwen Shen

{"title":"Synergistic strengthening and microstructure evolution of laser-cladded CoCrFeNiWx high-entropy alloy coatings with enhanced thermal fatigue and wear resistance","authors":"Taiqing Li , Qi Sui , Jianbin Zhang , Ying Han , Xiaolei Song , Xu Ran , Bingrun Yang , Shuai Wang , Shiyu He , Xianwen Shen","doi":"10.1016/j.intermet.2025.109142","DOIUrl":"10.1016/j.intermet.2025.109142","url":null,"abstract":"<div><div>Mechanical components operating under high-temperature service conditions are prone to thermal fatigue and wear failures. In this study, CoCrFeNiW high-entropy alloy (HEA) coatings with different tungsten (W) contents were fabricated by laser cladding, and their microstructure, thermal fatigue resistance, and post-fatigue wear behavior were systematically evaluated. Results show that increasing W content significantly improves microhardness and enhances resistance to thermal fatigue under cyclic heating from room temperature to 900 °C. The moderate addition of W facilitates the formation of a compact oxide layer, thereby reducing wear rate and improving tribological performance, with the optimum effect observed at W = 0.8. In contrast, excessive W addition (x = 1.0) accelerates crack propagation, leading to deteriorated wear resistance. These findings highlight the importance of tailoring W content to balance hardness, wear resistance, and thermal fatigue properties, providing valuable insights for the application of HEA coatings in high-temperature service environments.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"190 ","pages":"Article 109142"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Defect microstructure and hardening in uniformly damaged long-range-ordered (Fe, Ni)3V alloy under 528 MeV Xe ion irradiation 528mev Xe离子辐照下均匀损伤长程有序（Fe, Ni）3V合金的缺陷组织与硬化

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-03-01 Epub Date: 2026-01-20 DOI: 10.1016/j.intermet.2026.109166

Hui Liu , Shiwei Wang , Xiaoou Yi , Jing Hu , Sichen Dong , Wentuo Han , Pingping Liu , Ke Jin , Somei Ohnuki , Qian Zhan , Farong Wan , Naoyuki Hashimoto

{"title":"Defect microstructure and hardening in uniformly damaged long-range-ordered (Fe, Ni)3V alloy under 528 MeV Xe ion irradiation","authors":"Hui Liu , Shiwei Wang , Xiaoou Yi , Jing Hu , Sichen Dong , Wentuo Han , Pingping Liu , Ke Jin , Somei Ohnuki , Qian Zhan , Farong Wan , Naoyuki Hashimoto","doi":"10.1016/j.intermet.2026.109166","DOIUrl":"10.1016/j.intermet.2026.109166","url":null,"abstract":"<div><div>L1<sub>2</sub>-type (Fe, Ni)<sub>3</sub>V alloy is a promising candidate for high-temperature structural components. In this study, we investigated its defect microstructures and hardening response after creating a uniform 8 μm damage layer with 528 MeV Xe ions (350 °C/3 dpa). The alloy exhibited good phase stability in the ion-irradiation damaged layer. Microstructural analysis revealed production of irradiation-induced dislocation structures (both loops and lines) with a uniform density of 3.3 × 10<sup>14</sup> m/m<sup>3</sup>. No void swelling was observed. Dislocation loops dominated the total dislocation density, exhibiting a mild increase in mean size with depth (from 9.0 nm to 12.3 nm), driven by an enhanced tendency for one-dimensional (1D) ordering at greater depths. This reflects the migration and elastic interaction of ½<110> loops, which account for 83.1 % of the loop population and suggested to be mostly of interstitial nature by a high-voltage electron microscopy (HVEM) based approach. A minor fraction (∼16.9 %) of ⅓<111> Frank loops was also confirmed, the presence of which might stem from the breakdown of a small number of pre-existing ordered domains. The irradiation-induced hardening was measured at 0.55 GPa (∼11.8 %), a consequence of the pinning effect of the ½<110> loops impeding slip activation. These findings demonstrate the attractive potential of L1<sub>2</sub>-type (Fe, Ni)<sub>3</sub>V alloy for withstanding the lower end of operational temperatures and a benchmark damage dose anticipated in multiple nuclear reactor applications.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"190 ","pages":"Article 109166"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructural evolution and deformation mechanism in (CoCrFeNi)94Al3Ti3 high-entropy alloy ultrathin strips without intermediate annealing 未经中间退火的（CoCrFeNi）94Al3Ti3高熵合金超薄带材组织演变及变形机制

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-03-01 Epub Date: 2026-01-06 DOI: 10.1016/j.intermet.2025.109144

Lei Wu , Shengguo Ma , Tuanwei Zhang , Jianjun Wang , Dan Zhao , Zhiming Jiao , Zhihua Wang

{"title":"Microstructural evolution and deformation mechanism in (CoCrFeNi)94Al3Ti3 high-entropy alloy ultrathin strips without intermediate annealing","authors":"Lei Wu , Shengguo Ma , Tuanwei Zhang , Jianjun Wang , Dan Zhao , Zhiming Jiao , Zhihua Wang","doi":"10.1016/j.intermet.2025.109144","DOIUrl":"10.1016/j.intermet.2025.109144","url":null,"abstract":"<div><div>Ultrathin metal strips are widely used in precision electronic components, flexible electronic equipment, optics and aerospace due to their unique mechanical or functional performances. However, little research is focused on the high-entropy alloy (HEA) ultrathin strip that can be used as candidates for future metallic strips. Fortunately, the (CoCrFeNi)<sub>94</sub>Al<sub>3</sub>Ti<sub>3</sub> HEA ultrathin strip with a thickness of 50 μm was successfully prepared by the cumulative cold rolling method. Moreover, SEM, TEM, EBSD and quasi-static tensile testing were applied to study its microstructure evolution and mechanical property in terms of different sample thicknesses. The results show that the maximum tensile strength is obtained at the thickness of 0.1 mm, reaching 1428 MPa due to work hardening. Afterwards, work softening occurs, and at 0.05 mm, the tensile strength is about 1160 MPa. Further analysis reveals that, from 5 mm to 0.1 mm, the strengthening contributions of (CoCrFeNi)<sub>94</sub>Al<sub>3</sub>Ti<sub>3</sub> HEA strips are mainly from dislocation strengthening and grain boundary strengthening, while when the strip size reduces to be 0.05 mm, the degradation of mechanical property is unavoided due to abnormal dislocation annihilation and surface crystal effect, resulting in work softening. This work could provide a theoretical and experimental guidance for the development of high performance high-entropy alloy ultrathin strips.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"190 ","pages":"Article 109144"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145898058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure and hydrogen sorption of severely deformed TaTiVCrFe and ZrTiVCrFe refractory high-entropy alloys 严重变形TaTiVCrFe和ZrTiVCrFe难熔高熵合金的显微组织和吸氢性能

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-03-01 Epub Date: 2026-01-07 DOI: 10.1016/j.intermet.2026.109148

Farnoosh Naderi , Hamed Shahmir , Farzaneh Zareipour , Yi Huang , Mohammad Ismail

{"title":"Microstructure and hydrogen sorption of severely deformed TaTiVCrFe and ZrTiVCrFe refractory high-entropy alloys","authors":"Farnoosh Naderi , Hamed Shahmir , Farzaneh Zareipour , Yi Huang , Mohammad Ismail","doi":"10.1016/j.intermet.2026.109148","DOIUrl":"10.1016/j.intermet.2026.109148","url":null,"abstract":"<div><div>Multi-phase refractory high-entropy alloys with hydride forming elements containing body-centered cubic and Laves phases have a great potential in solid-state hydrogen storage applications. Significant hydrogen sorption capacity close to ambient temperature without activating together fast hydrogen sorption kinetics are considered as important delima for this purpose. The present investigation was conducted to process TaTiVCrFe and ZrTiVCrFe refractory high-entropy alloys by severe plastic deformation in order to satisfy these requirements. Two alloys represented noted multi-phase microstructure before and after high-pressure torsion process. In addition, thermal stability of severely deformed samples were studied after long-term annealing at an elevated temperature of 973 K. Fast hydrogen sorption was detected up to 1.04 and 2.53 wt% for severely deformed TaTiVCrFe and ZrTiVCrFe alloys, respectively, with no incubation time. Introducing structural defects, formation of a high-volume fraction of interfaces between different phases due to phase fragmentation and formation of nano/micro cracks in the severely deformed microstructure provided faster diffusion pathway and more nucleation of hydrides. High thermal stability of the processed alloys allow them to use the advantages of severe plastic deformation on the functional properties of refractory high-entropy alloys over a wide temperature range.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"190 ","pages":"Article 109148"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on elastic properties, fracture toughness, electronic properties and thermal conductivity of the M-Mg(ZnAlCu)2 phase in aluminum alloys via first-principles calculations and experiments 通过第一性原理计算和实验研究铝合金中M-Mg(ZnAlCu)2相的弹性性能、断裂韧性、电子性能和导热性

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-03-01 Epub Date: 2026-01-09 DOI: 10.1016/j.intermet.2026.109159

Shanming Fan , Mingjun Peng , Jun Li , Qing Yu , Lianjian Wen , Mingnie Li

{"title":"Study on elastic properties, fracture toughness, electronic properties and thermal conductivity of the M-Mg(ZnAlCu)2 phase in aluminum alloys via first-principles calculations and experiments","authors":"Shanming Fan , Mingjun Peng , Jun Li , Qing Yu , Lianjian Wen , Mingnie Li","doi":"10.1016/j.intermet.2026.109159","DOIUrl":"10.1016/j.intermet.2026.109159","url":null,"abstract":"<div><div>This work investigates the phase stability, elastic properties, fracture toughness, electronic structure, and thermal conductivity of the M-Mg(Zn,Al,Cu)<sub>2</sub> phase using first-principles calculations. Based on the crystal structure of MgZn<sub>2</sub>, two distinct doping sites were considered, substituting with Cu and Al atoms, respectively. The results indicate that the doped MgZn<sub>2</sub> is thermodynamically stable, suggesting a high tendency for the M-phase to form. Furthermore, Cu atoms exhibit a strong preference for occupying the Zn sites. The incorporation of Al and Cu atoms enhances the alloy's elastic modulus and anisotropy, while also improving its ductility. Moreover, when Cu occupies the Zn2 site, it simultaneously increases both the thermal conductivity and fracture toughness of MgZn<sub>2</sub>. This enhancement is attributed to the strong covalent bonds formed between Cu and its neighboring Zn and Mg atoms, which significantly strengthen the chemical bonding.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"190 ","pages":"Article 109159"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of true strain on hot deformation behavior and microstructural evolution of Incoloy 825 superalloy 真应变对incoly 825高温合金热变形行为及组织演变的影响

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-03-01 Epub Date: 2026-01-21 DOI: 10.1016/j.intermet.2026.109167

Yuewu Zheng , Yaohui Song , Yugui Li

{"title":"Effect of true strain on hot deformation behavior and microstructural evolution of Incoloy 825 superalloy","authors":"Yuewu Zheng , Yaohui Song , Yugui Li","doi":"10.1016/j.intermet.2026.109167","DOIUrl":"10.1016/j.intermet.2026.109167","url":null,"abstract":"<div><div>Vacuum isothermal compression tests were carried out on die-cast Incoloy 825 superalloy using a Gleeble-3800 thermal simulator at 1050 °C and a strain rate of 0.01 s<sup>−1</sup>. The aim was to systematically investigate its hot deformation behavior and microstructural evolution at different true strain levels. The true stress-true strain curves exhibit a typical work-hardening–softening–steady-state flow behavior, in which dynamic recrystallization (DRX) is the dominant softening mechanism. With increasing true strain, the DRX volume fraction follows a “S” increase. Meanwhile, the average grain size is refined from ∼97.8 μm in the original microstructure to ∼11.2 μm at <span><math><mrow><mi>ε</mi></mrow></math></span> = 0.92, where nearly full DRX is achieved and a uniform, fine equiaxed microstructure is obtained. Microstructural analysis indicates that DRX is jointly controlled by discontinuous dynamic recrystallization (DDRX) dominated by grain-boundary bulging and continuous dynamic recrystallization (CDRX) mediated by subgrain rotation. During deformation, low-angle grain boundaries (LAGBs) are progressively transformed into high-angle grain boundaries (HAGBs), whereas the fraction of Σ3 twin boundaries (Σ3 TBs) increases significantly. These changes help to stabilize and refine the recrystallized grains. This study clarifies the coupled roles of DDRX, CDRX and Σ3 TBs during the hot deformation of Incoloy 825 superalloy and provides a strain-based guideline for optimizing its hot-working process and grain boundary engineering design.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"190 ","pages":"Article 109167"},"PeriodicalIF":4.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0