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Effects of substituting Mo for W and temperature on γ/γ′ lattice misfits of second generation Ni based single crystal superalloys
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-02-22 DOI: 10.1016/j.intermet.2025.108710
Cheng Ai , Kaiwen Li , Xiaojing Xu , Yi Ru , Heng Zhang , Shusuo Li , Shengkai Gong , Hanwei Jiang , Min Guo , Taiwen Huang , Lin Liu
{"title":"Effects of substituting Mo for W and temperature on γ/γ′ lattice misfits of second generation Ni based single crystal superalloys","authors":"Cheng Ai ,&nbsp;Kaiwen Li ,&nbsp;Xiaojing Xu ,&nbsp;Yi Ru ,&nbsp;Heng Zhang ,&nbsp;Shusuo Li ,&nbsp;Shengkai Gong ,&nbsp;Hanwei Jiang ,&nbsp;Min Guo ,&nbsp;Taiwen Huang ,&nbsp;Lin Liu","doi":"10.1016/j.intermet.2025.108710","DOIUrl":"10.1016/j.intermet.2025.108710","url":null,"abstract":"<div><div>In this investigation, effects of substituting Mo for W and temperature on lattice constants of γ and γ′ phases and γ/γ′ misfits of second generation Ni based single crystal superalloys was investigated. The lattice constants of γ and γ′ phases in heat-treated W-rich and Mo-rich single crystal superalloys were measured by in-situ high temperature X-ray diffraction (HT-XRD) at temperature ranged from room temperature to 1150 °C. Meanwhile, both thermodynamic calculation and Vegard's law (considering thermal expansion coefficient) were used to calculate lattice constants of γ and γ′ phases and γ/γ′ misfits of two experimental alloys. Both experiment and calculation results indicated that substituting Mo for W obviously increased lattice constant of γ phase, while its influence on lattice constant of γ′ phase was limited, and thus substituting Mo for W significantly decreased γ/γ′ misfit. Meanwhile, the experimental results of HT-XRD indicated that absolute value of γ/γ′ misfits of two experimental alloys at 1100 °C were higher than those of at 1150 °C, which was in good agreement with evolution rule of γ/γ′ interfacial dislocation network spacings in two experimental alloys (after creep rupture at 1100 °C and 1150 °C).</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108710"},"PeriodicalIF":4.3,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471493","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
Phase equilibria in the Fe-rich corner of the Fe-Nb-Zr system at 1200 °C
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-02-22 DOI: 10.1016/j.intermet.2025.108712
M.R. Tolosa , G. Aurelio , L. Acosta , N. Nieva
{"title":"Phase equilibria in the Fe-rich corner of the Fe-Nb-Zr system at 1200 °C","authors":"M.R. Tolosa ,&nbsp;G. Aurelio ,&nbsp;L. Acosta ,&nbsp;N. Nieva","doi":"10.1016/j.intermet.2025.108712","DOIUrl":"10.1016/j.intermet.2025.108712","url":null,"abstract":"<div><div>The Fe-rich corner of the Fe-Nb-Zr phase diagram was studied at 1200 °C by using synchrotron X-ray diffraction and quantitative electron probe microanalysis. The Fe<sub>2</sub>Nb(C14) hexagonal Laves phase, Fe<sub>23</sub>Zr<sub>6</sub> and Fe(α) compounds were found. The existence of two three-phase fields (Fe<sub>2</sub>(Zr<sub>1-x</sub>Nbx)(C14) + Fe(α) + Fe<sub>23</sub>Zr<sub>6</sub>) and (Fe<sub>2</sub>(Zr<sub>1-x</sub>Nb<sub>x</sub>)(C14) + Fe<sub>2</sub>Zr(C15) + Fe<sub>23</sub>Zr<sub>6</sub>) and five two-phase fields (Fe<sub>2</sub>(Zr<sub>1-x</sub>Nb<sub>x</sub>)C14 + Fe(α)), (Fe(α) + Fe<sub>23</sub>Zr<sub>6</sub>), (Fe<sub>23</sub>Zr<sub>6</sub> + Fe<sub>2</sub>Zr(C15)), (Fe<sub>2</sub>(Zr<sub>1-x</sub>Nb<sub>x</sub>)(C14) + Fe<sub>23</sub>Zr<sub>6</sub>) and (Fe<sub>2</sub>(Zr<sub>1-x</sub>Nb<sub>x</sub>)(C14) + Fe<sub>2</sub>Zr(C15)) are proposed in the present work. The phase diagram section at 1200 °C in the Fe-rich corner of the Fe-Nb-Zr system has been re-drawn.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108712"},"PeriodicalIF":4.3,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465518","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
Development of a Ti49Zr20Hf15Al10Nb6 high entropy shape memory alloy for biomedical applications
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-02-20 DOI: 10.1016/j.intermet.2025.108711
Zhaolin Hua , Lin Guo , Yun Zhang , Yilong Dai , Dechuang Zhang , Fangsheng Mei , Jianguo Lin
{"title":"Development of a Ti49Zr20Hf15Al10Nb6 high entropy shape memory alloy for biomedical applications","authors":"Zhaolin Hua ,&nbsp;Lin Guo ,&nbsp;Yun Zhang ,&nbsp;Yilong Dai ,&nbsp;Dechuang Zhang ,&nbsp;Fangsheng Mei ,&nbsp;Jianguo Lin","doi":"10.1016/j.intermet.2025.108711","DOIUrl":"10.1016/j.intermet.2025.108711","url":null,"abstract":"<div><div>Titanium (Ti)-rich high entropy shape memory alloys (HESMAs) exhibit excellent mechanical properties and the biocompatibility of Ti alloys. Researches on the biomedical applications of the HESMAs are urgently needed to identify metallic biomaterials superior to the traditional Ni–Ti and Ti–6Al–4V (Ti64) alloys. In this study, a Ti-rich HESMA, designated as Ti<sub>49</sub>Zr<sub>20</sub>Hf<sub>15</sub>Al<sub>10</sub>Nb<sub>6</sub> (in atomic percent, at. %), was synthesized using an arc melting and suction casting method. The investigation focused on its mechanical properties, superelasticity, wear resistance, corrosion resistance, and biocompatibility. The Ti-rich HESMA demonstrated superior attributes in terms of strength, elastic modulus, wear and corrosion resistance, and biocompatibility when compared to Ni–Ti and Ti64 alloys. Despite its elemental complexity, the as-cast Ti-rich HESMA achieved a homogeneous composition and maintained a sole β phase consisting of equiaxed grains with an average size of 52 μm, leading to a low elastic modulus of 83.9 GPa. Notably, the Ti-rich HESMA exhibits superelasticity at room temperature, with a maximum recoverable strain of approximately 3.8 %. Moreover, it demonstrates superior wear resistance compared to Ni–Ti and Ti64. Additionally, the Ti-rich HESMA shows high corrosion resistance in Hanks’ solution and favorable cytocompatibility relative to Ni–Ti and Ti64. Overall, the Ti-rich HESMA represents a promising avenue for the development of innovative metallic biomaterials.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108711"},"PeriodicalIF":4.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453606","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 elevated temperature and stress state on ductile fracture behaviors in titanium alloy: Experiments and modeling
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-02-20 DOI: 10.1016/j.intermet.2025.108708
Rui Feng, Minghe Chen, Lansheng Xie, Hongrui Dong
{"title":"Effect of elevated temperature and stress state on ductile fracture behaviors in titanium alloy: Experiments and modeling","authors":"Rui Feng,&nbsp;Minghe Chen,&nbsp;Lansheng Xie,&nbsp;Hongrui Dong","doi":"10.1016/j.intermet.2025.108708","DOIUrl":"10.1016/j.intermet.2025.108708","url":null,"abstract":"<div><div>This research aims to characterize the effects of elevated temperature and stress state on the yield and fracture behavior of forged TC4 alloy. The uniaxial tensile, compression, and shear experiments were performed with different geometry under wide stress triaxiality at 760–800 °C. The experimental results indicate that the strength of TC4 titanium alloy decreases monotonously and unevenly with the temperature increase. The tension-compression asymmetry changes nonlinearly with temperature and strain, and this asymmetry decreases with increasing temperature. With the increase of stress triaxiality, the dimples in the fracture morphology become larger and deeper, and the ductile fracture mechanism changes from shear fracture to dimple fracture mechanism. A modified-JC constitutive model was proposed, and the coefficient of determination are about 0.981 and 0.971 for UTS and UCS. The temperature related yield function of Cazacu-Barlat2004 was constructed to describe the non-uniform evolution characteristics related to temperature and strain, and the fracture-related variables were calibrated with the hybrid experimental and numerical method under acceptable prediction accuracy. Finally, the temperature-related variables were successfully introduced into the DF2016 fracture model, and the fracture occurrence under different temperature and stress states were predicted with small prediction error. These research results can provide a basis for the shape and performance control of titanium alloy in the hot forming process.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108708"},"PeriodicalIF":4.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445072","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
Selective laser melting of near Ti-5321 β titanium alloy: Microstructure, mechanical properties and deformation mechanism
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-02-17 DOI: 10.1016/j.intermet.2025.108688
Changfu Li , Wenlong Lu , Dezhi Wang , Yuhang Ren , Chao Wang , Guang Yang
{"title":"Selective laser melting of near Ti-5321 β titanium alloy: Microstructure, mechanical properties and deformation mechanism","authors":"Changfu Li ,&nbsp;Wenlong Lu ,&nbsp;Dezhi Wang ,&nbsp;Yuhang Ren ,&nbsp;Chao Wang ,&nbsp;Guang Yang","doi":"10.1016/j.intermet.2025.108688","DOIUrl":"10.1016/j.intermet.2025.108688","url":null,"abstract":"<div><div>In this work, the microstructure of near β Ti-5321 (Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe) alloy was optimized by varying the parameters of the selective laser melting (SLM) process. The room-temperature tensile properties of the samples were tested, and the deformation mechanism was analyzed. Fully dense sample preparation was achieved by changing the laser power and scanning speed parameters of SLM. The results of electron backscatter diffraction (EBSD) analysis showed that as-depositedsample containe columnar β grains with &lt;001&gt;//BD texture, and the width of the grains increased with the increase of laser power. The total elongation of the Ti-5321 alloy sample reaches 17 % and the ultimate tensile strength is 1126 MPa at room temperature tensile; the presence of α″ phase and {332}&lt; 113&gt; and {112}&lt; 111&gt; deformation twins in the microstructure of the sample near the tensile fracture suggests that the sample contains multiple deformation mechanisms, i.e, dislocation slip, transformation-induced plasticity (TRIP), and twinning-induced plasticity (TWIP).</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108688"},"PeriodicalIF":4.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428955","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
In-situ study of FeCoCrMoCBTm high entropy bulk metallic glasses with high thermal stability via high-energy synchrotron X-ray diffraction
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-02-17 DOI: 10.1016/j.intermet.2025.108706
Wei Chen , Zhichao Lu , Chengzhe Wang , Xiaolong Li , Ming Yang , Guanhaojie Zheng , Yibo Zhang , Xuerui Wei , Yan Huang , Fan Zhang , Fanqiang Meng , Zhou Zhou , Dong Ma
{"title":"In-situ study of FeCoCrMoCBTm high entropy bulk metallic glasses with high thermal stability via high-energy synchrotron X-ray diffraction","authors":"Wei Chen ,&nbsp;Zhichao Lu ,&nbsp;Chengzhe Wang ,&nbsp;Xiaolong Li ,&nbsp;Ming Yang ,&nbsp;Guanhaojie Zheng ,&nbsp;Yibo Zhang ,&nbsp;Xuerui Wei ,&nbsp;Yan Huang ,&nbsp;Fan Zhang ,&nbsp;Fanqiang Meng ,&nbsp;Zhou Zhou ,&nbsp;Dong Ma","doi":"10.1016/j.intermet.2025.108706","DOIUrl":"10.1016/j.intermet.2025.108706","url":null,"abstract":"<div><div>Fe-based bulk metallic glasses (BMGs) exhibit good potential application in magnetic-electrical parts and anti-corrosion scenarios due to the good soft magnetic and mechanical properties. Despite their good properties, Fe-based BMGs generally suffer from the crystallization from a metastable glass state via structural relaxation, nucleation, and grain growth upon heating. Thus, pursuing high thermal stability is essentially the holy grail of the BMG research community. In this work, we successfully developed a series of FeCoCrMoCBTm high entropy BMGs (HE-BMGs) with superior thermal stability via microalloying and entropy tuning. Among these developed alloys, the Fe<sub>33</sub>Co<sub>15</sub>Cr<sub>17</sub>Mo<sub>13</sub>C<sub>15</sub>B<sub>6</sub>Tm<sub>2</sub> HE-BMG exhibits the best thermal stability with crystallization temperature exceeding 900 K (916 K) and activation energy of 510.3 ± 30 kJ/mol, which is higher than most of the conventional metallic glasses (MGs). The <em>in-situ</em> high energy synchrotron X-ray diffraction of Fe<sub>33</sub>Co<sub>15</sub>Cr<sub>17</sub>Mo<sub>13</sub>C<sub>15</sub>B<sub>6</sub>Tm<sub>2</sub> HE-BMG upon heating was carried out to further clarify the phase transformation mechanism and its correlation to thermal stability. This study offers some important insights into the crystallization path and thermal stability of HE-BMGs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108706"},"PeriodicalIF":4.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428954","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
Enhanced fracture properties by heterogeneous grain structures and dual nanoprecipitates
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-02-16 DOI: 10.1016/j.intermet.2025.108707
Jian Wang , Shengde Zhang , Wei Wang , Xiaolei Wu , Fuping Yuan
{"title":"Enhanced fracture properties by heterogeneous grain structures and dual nanoprecipitates","authors":"Jian Wang ,&nbsp;Shengde Zhang ,&nbsp;Wei Wang ,&nbsp;Xiaolei Wu ,&nbsp;Fuping Yuan","doi":"10.1016/j.intermet.2025.108707","DOIUrl":"10.1016/j.intermet.2025.108707","url":null,"abstract":"<div><div>Excellent synergy of yield strength and fracture toughness has been achieved in a lightweight steel by deploying heterogeneous structures and dual nanoprecipitates. Two microstructures with similar yield strength (about 1.1 GPa) have been fabricated, one is the fully recrystallized heterogeneous grain structure with higher volume fraction of nanoprecipitates (HGS1), and the other one is the heterogeneous lamella structure consisting of both un-recrystallized and recrystallized areas with lower volume fraction of nanoprecipitates (HLS). The HGS1 shows higher uniform elongation and higher fracture toughness compared to the HLS. The HGS1 displays larger size of plastic zone and higher hardening capacity around the crack tip compared to the HLS. The plastic deformation around the crack tip is accommodated by the planar dislocation slips and the formation of parallel slip bands on two {111} planes for both samples. The average interspacing of the slip bands for the HGS1 sample is found to be smaller than that for the HLS sample, indicating a stronger hardening around the crack tip for the HGS1 sample. The higher fracture toughness of the HGS1 sample can be attributed to the stronger hardening around the crack tip by the smaller spacing of planar slip bands and the stronger precipitation hardening.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108707"},"PeriodicalIF":4.3,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420836","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 hardening mechanisms of oxygen-doped (Fe3Co2Ni2Cr3)94-xAlxO6 multi-principal element alloys
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-02-15 DOI: 10.1016/j.intermet.2025.108655
Xin Han , Chong Peng , Guangtong Zhou , Chan Han , Kenan Li , Ningchang Wang , Shuju Liang , Rui Li , Yujiao Ke
{"title":"Microstructure and hardening mechanisms of oxygen-doped (Fe3Co2Ni2Cr3)94-xAlxO6 multi-principal element alloys","authors":"Xin Han ,&nbsp;Chong Peng ,&nbsp;Guangtong Zhou ,&nbsp;Chan Han ,&nbsp;Kenan Li ,&nbsp;Ningchang Wang ,&nbsp;Shuju Liang ,&nbsp;Rui Li ,&nbsp;Yujiao Ke","doi":"10.1016/j.intermet.2025.108655","DOIUrl":"10.1016/j.intermet.2025.108655","url":null,"abstract":"<div><div>A series of oxygen-doped (Fe<sub>3</sub>Co<sub>2</sub>Ni<sub>2</sub>Cr<sub>3</sub>)<sub>94-<em>x</em></sub>Al<sub><em>x</em></sub>O<sub>6</sub> (<em>x</em> = 3–7 at.%) multi-principal element alloys (MPEAs) was synthesized via mechanical alloying (MA) and subsequently consolidated by high-pressure and high-temperature sintering (HPHT), and the effect of Al contents on the microstructure and hardening mechanisms was investigated systematically. Detailed microstructural characterizations indicate that (Fe<sub>3</sub>Co<sub>2</sub>Ni<sub>2</sub>Cr<sub>3</sub>)<sub>94-<em>x</em></sub>Al<sub><em>x</em></sub>O<sub>6</sub> MPEAs are composed of nanocrystalline FCC matrix, and ultrafine grained Cr-rich oxides, as well as the particle size of the Cr-rich oxides decreases and the distribution is gradually uniform with increasing Al contents. The (Fe<sub>3</sub>Co<sub>2</sub>Ni<sub>2</sub>Cr<sub>3</sub>)<sub>87</sub>Al<sub>7</sub>O<sub>6</sub> MPEA contains small nanocrystalline Al-rich oxides. Attributed to grain boundary strengthening and strain hardening, (Fe<sub>3</sub>Co<sub>2</sub>Ni<sub>2</sub>Cr<sub>3</sub>)<sub>87</sub>Al<sub>7</sub>O<sub>6</sub> shows a high Vickers hardness of 6.98 ± 0.16 GPa, higher than that of most previously reported FCC structured HEAs. Estimated from Tabor's equation, the Tabor's ratio attains a value of ∼2.96, consistent with that of conventional polycrystalline materials. This work provides a novel pathway for hardening MPEAs and widens the design toolbox for other high-performance materials, given the typical Tabor ratio.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108655"},"PeriodicalIF":4.3,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420810","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
Broadening the working temperature interval in a magneto-structural coupled Ni–Mn–Ga microparticle via introducing a free surface
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-02-13 DOI: 10.1016/j.intermet.2025.108704
Shijiang Zhong , Mengjiao Wang , Mingfang Qian , Xinhao Wan , Xuexi Zhang , Lin Geng
{"title":"Broadening the working temperature interval in a magneto-structural coupled Ni–Mn–Ga microparticle via introducing a free surface","authors":"Shijiang Zhong ,&nbsp;Mengjiao Wang ,&nbsp;Mingfang Qian ,&nbsp;Xinhao Wan ,&nbsp;Xuexi Zhang ,&nbsp;Lin Geng","doi":"10.1016/j.intermet.2025.108704","DOIUrl":"10.1016/j.intermet.2025.108704","url":null,"abstract":"<div><div>In the field of magnetic refrigeration, magnetic materials that can exhibit both a giant magnetic entropy change (Δ<em>S</em><sub><em>m</em></sub>) and a widened working temperature interval (<em>δT</em><sub><em>FWHM</em></sub>) are being pursued. To obtain an enhanced magnetic entropy change, this study designed a magneto-structural coupled (i.e., overlapping the martensitic and magnetic transitions) Ni–Mn–Ga bulk ingot; however, it possessed a relatively narrow <em>δT</em><sub><em>FWHM</em></sub> of 10 K. To broaden its <em>δT</em><sub><em>FWHM</em></sub>, a microparticle with size varying from ∼38.5 to 45 μm was produced by grinding the bulk ingot and by subsequently subjecting it to stress relief annealing (SRA). Consequently, an expanded martensitic transformation width of 14 K and a broadened <em>δT</em><sub><em>FWHM</em></sub> of 15 K were achieved in the SRA state. Meanwhile, the average magnetic hysteresis was reduced from 21.8 J kg<sup>−1</sup> to 16.8 J kg<sup>−1</sup> by preparing the alloy in the microparticle configuration. Therefore, an enhanced net refrigeration capacity value of 104.0 J kg<sup>−1</sup> under 5 T was achieved in the SRA microparticle compared with that of 57.7 J kg<sup>−1</sup> in the bulk ingot. The strategy of increasing the specific surface area and regulating the internal stress can be used to expand a refrigerant's <em>δT</em><sub><em>FWHM</em></sub>, thereby helping achieve a higher magnetic refrigeration capacity in Ni–Mn–X alloys.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108704"},"PeriodicalIF":4.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394403","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
An investigation on high-temperature properties of a lightweight AlNbTiV2 refractory high-entropy alloy reinforced by Si
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-02-12 DOI: 10.1016/j.intermet.2025.108705
Tiantian Wang , Wentao Jiang , Xiaohong Wang , Bo Jiang , Xin Wang , Ye Wang , Hongyu Xu , Maoliang Hu , Dongdong Zhu
{"title":"An investigation on high-temperature properties of a lightweight AlNbTiV2 refractory high-entropy alloy reinforced by Si","authors":"Tiantian Wang ,&nbsp;Wentao Jiang ,&nbsp;Xiaohong Wang ,&nbsp;Bo Jiang ,&nbsp;Xin Wang ,&nbsp;Ye Wang ,&nbsp;Hongyu Xu ,&nbsp;Maoliang Hu ,&nbsp;Dongdong Zhu","doi":"10.1016/j.intermet.2025.108705","DOIUrl":"10.1016/j.intermet.2025.108705","url":null,"abstract":"<div><div>A series of novel AlNbTiV<sub>2</sub>Si<sub>x</sub> (x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) refractory high-entropy alloys were fabricated by vacuum arc melting. The effects of Si content on the crystal structure, microstructure and high-temperature mechanical properties of the alloys were systematically investigated, and the mechanism of properties enhancement was analyzed in depth. The results showed that the addition of Si resulted in the formation of a hexagonal close-packed M<sub>5</sub>Si<sub>3</sub>-type silicide phase (M = Al, Nb, Ti, and V), transforming the alloy from a single BCC structure to a dual-phase structure of BCC + M<sub>5</sub>Si<sub>3</sub>, and increasing the volume fraction of M<sub>5</sub>Si<sub>3</sub> phase to 23.1 %. Furthermore, an increase in Si content is beneficial to reduce the density of the alloy. When the Si content reaches 0.5, the alloy density decreases by about 7.0 %. The results of high-temperature compression tests show that the yield strength of AlNbTiV<sub>2</sub>Si<sub>x</sub> alloys has increased by nearly 70 % at 873 K, and AlNbTiV<sub>2</sub>Si<sub>0.5</sub> alloy has the highest yield strength at 1073 K, reaching 1154 MPa. The mechanism of properties enhancement is attributed to the second phase strengthening. When the temperature continues to increase to 1273 K, the strengthening effect of silicides becomes weaker, and the yield strength of AlNbTiV<sub>2</sub>Si<sub>x</sub> alloys is not significantly different, all around 200 MPa, indicating the dominant role of solid solution strengthening. In addition, the solidification path of AlNbTiV<sub>2</sub>Si<sub>x</sub> alloys was analyzed and discussed. Our current work contributes to the design of new high-performance lightweight alloys with controllable structure, and provides a reference for future research, development, and production utilization.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108705"},"PeriodicalIF":4.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394404","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}
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