IntermetallicsPub Date : 2025-02-01DOI: 10.1016/j.intermet.2024.108602
H.R. Cheng , Z. Wang , J. Brechtl , W. Wen , M. Zhang , Z.H. Wang , J.W. Qiao
{"title":"A prediction model of failure threshold for shear deformation in a Zr-based bulk metallic glass","authors":"H.R. Cheng , Z. Wang , J. Brechtl , W. Wen , M. Zhang , Z.H. Wang , J.W. Qiao","doi":"10.1016/j.intermet.2024.108602","DOIUrl":"10.1016/j.intermet.2024.108602","url":null,"abstract":"<div><div>The failure of bulk metallic glasses (BMGs) during plastic deformation at room temperature is abrupt and instantaneous, while the analysis of precursor information based on avalanche events helps predict catastrophic failure. An acoustic emission (AE) signal can provide accurate precursor information for material failure, due to its sensitive and high fast calculation ability. In the current study, AE monitoring tests are carried out during uniaxial compression tests of BMGs at different strain rates. The AE experimental failure threshold, <em>E</em><sub>max</sub>, is proposed on the basis of AE cumulative energy, which reflects the intensity of damage evolution at different loading conditions. Compared with the critical shear band velocity (CSBV) associated with stick-slip dynamics of serrated flow, <em>E</em><sub>max</sub> is a more sensitive failure parameter since it is connected with the local microscopic changes that occur during the material response process. Here, the <em>E</em><sub>max</sub> is obtained prior to reaching the CSBV since the calculation of these two avalanches analysis focuses on the different stages of shear band growth. In particular, AE events are related to the “dry” friction process in the first stage, however, the CSBV is responsible for the “viscous” glide in the second stage. Therefore, <em>E</em><sub>max</sub> is not affected by the complex interactions between the shear bands during the stick-slip process. The maximum avalanche of serrated flow, <em>S</em><sub>max</sub>, is proposed as the experimental failure threshold, which depends on the applied strain rate as <span><math><mrow><msub><mi>S</mi><mrow><mi>max</mi><mspace></mspace></mrow></msub><mo>∼</mo><mspace></mspace><msup><mover><mi>ε</mi><mo>˙</mo></mover><mrow><mo>−</mo><mi>λ</mi></mrow></msup></mrow></math></span>. According to the relationship of <em>E</em><sub>max</sub> and <em>S</em><sub>max</sub>, the theoretical failure threshold, <em>E</em><sub>max</sub>, follows a criterion <span><math><mrow><msub><mi>E</mi><mrow><mi>max</mi><mspace></mspace></mrow></msub><mo>=</mo><mn>2545</mn><msup><mover><mi>ε</mi><mo>˙</mo></mover><mrow><mo>−</mo><mi>λ</mi></mrow></msup><mo>‐</mo><mspace></mspace><mn>4468</mn></mrow></math></span>, where <em>λ</em> is equivalent to 0.15 for this work. Combining the different calculations and AE measurements, this model gives new insights to predict the deformation failure behavior of Zr-based BMGs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108602"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095388","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}
IntermetallicsPub Date : 2025-02-01DOI: 10.1016/j.intermet.2024.108584
F.C. Wang , Y.H. Gao , M.C. Jian , Y.B. Wang , Y. Huang , Y.Y. Sun , Y.Z. Liu , F. Xu , C. Kursun , Y. Zhang , J.T. Huo , J.Q. Wang , M. Gao
{"title":"Revealing the disparate defect evolution paths with loading rates for ductile and brittle metallic glasses via nanoscale creep","authors":"F.C. Wang , Y.H. Gao , M.C. Jian , Y.B. Wang , Y. Huang , Y.Y. Sun , Y.Z. Liu , F. Xu , C. Kursun , Y. Zhang , J.T. Huo , J.Q. Wang , M. Gao","doi":"10.1016/j.intermet.2024.108584","DOIUrl":"10.1016/j.intermet.2024.108584","url":null,"abstract":"<div><div>Ductile and brittle metallic glasses display significantly different mechanical behaviors. However, the microscopic deformation mechanisms and the defect dynamics in different metallic glasses remain unclear. In this work, an experimental strategy based on nanoscale creep was used to detect the defect evolution dynamics at different loading rates for six metallic glasses with varying plasticity. The plastic deformation ability and the strain rate sensitivity of these metallic glasses under different loading rates were systematically investigated. Furthermore, the evolution of defect volume and relaxation time spectrum under varying loading rates was analyzed utilizing the Cooperative Shearing model in conjunction with the Maxwell-Kelvin model. It was observed that ductile and brittle metallic glasses display markedly different defect dynamics at varying loading rates. Finally, a scheme was introduced to illustrate different defect evolution paths with various loading rates for ductile and brittle metallic glasses based on their heterogeneous viscoelastic structure. The study provides insights into the differences in microscopic deformation mechanism and their structural origins in various amorphous materials.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108584"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095885","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}
IntermetallicsPub Date : 2025-02-01DOI: 10.1016/j.intermet.2024.108607
Z. Wang , J.Y. Ruan , F. Jin, W. Li, C.C. Yuan
{"title":"Effect of Cu on thermal and magnetocaloric properties of (GdTbHo)CoAl high-entropy metallic glasses","authors":"Z. Wang , J.Y. Ruan , F. Jin, W. Li, C.C. Yuan","doi":"10.1016/j.intermet.2024.108607","DOIUrl":"10.1016/j.intermet.2024.108607","url":null,"abstract":"<div><div>(Gd<sub>1/3</sub>Tb<sub>1/3</sub>Ho<sub>1/3</sub>)<sub>55</sub>Co<sub>17.5</sub>Al<sub>27.5-x</sub>Cu<sub>x</sub> (x = 5, 10, 15, and 20) metallic glasses (MGs) with a high configurational entropy (Δ<em>S</em><sub>conf</sub>) of 1.723–1.754 <em>R</em> were successfully prepared by arc melting technology. Their glass-forming ability (GFA), thermodynamic behavior, and magnetocaloric effect (MCE) upon Cu addition were investigated thoroughly. Upon Cu addition, both <em>T</em><sub>g</sub> and the <em>T</em><sub>x</sub> significantly decrease with increasing 3<em>d</em> electron number due to the weakened <em>f-d</em> hybridization effect. The (Gd<sub>1/3</sub>Tb<sub>1/3</sub>Ho<sub>1/3</sub>)<sub>55</sub>Co<sub>17.5</sub>Al<sub>12.5</sub>Cu<sub>15</sub> with 15 at. % Cu exhibits a maximum value of GFA criteria, including <em>T</em><sub>rg</sub>, <em>γ</em>, and <em>γ</em><sub>m</sub>, as well as the lowest degree of structural order, indicating its optimal GFA, which is likely associated with the high-entropy effect and suppressed crystallization behavior. Moreover, it is found that the refrigeration capacity (RCP) also reaches a peak value of 624.83 J kg<sup>−1</sup> with a relatively larger peak magnetic entropy change (<span><math><mrow><mrow><mrow><mo>|</mo><mo>Δ</mo></mrow><msubsup><mi>S</mi><mi>M</mi><mrow><mi>p</mi><mi>k</mi></mrow></msubsup></mrow><mo>|</mo></mrow></math></span>) of 8.75 J kg<sup>−1</sup> K<sup>−1</sup> at the composition with 15 at. % Cu, accompanied by an abnormally high Curie temperature (<em>T</em><sub>C</sub>) of 59 K, which is attributed to the high experimental <em>μ</em><sub>eff</sub> of (Gd<sub>1/3</sub>Tb<sub>1/3</sub>Ho<sub>1/3</sub>)<sub>55</sub>Co<sub>17.5</sub>Al<sub>12.5</sub>Cu<sub>15</sub> as a result of the intensified magnetic interaction between rare-earth (RE) elements for alloying Cu with small size. Our work indicates that Cu is an effective element for manipulating the thermal and magnetic properties of magnetocaloric materials by influencing their microstructure, orbital hybridization effects, and magnetic exchange interactions.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108607"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095894","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}
IntermetallicsPub Date : 2025-02-01DOI: 10.1016/j.intermet.2024.108586
Fengyi Zhang , Lijun Zhang , Xueming Wei , Chunzhi Zhang , Qixiang Jia , Kai Sun , Dongtao Duan , Gong Li
{"title":"Corrosion and passive behaviors of the Co-Cr-Fe-Ni-Nb eutectic high-entropy alloys in different electrolyte solutions","authors":"Fengyi Zhang , Lijun Zhang , Xueming Wei , Chunzhi Zhang , Qixiang Jia , Kai Sun , Dongtao Duan , Gong Li","doi":"10.1016/j.intermet.2024.108586","DOIUrl":"10.1016/j.intermet.2024.108586","url":null,"abstract":"<div><div>The corrosion and passive behaviors of CoCrFeNiNb<sub>x</sub> (x = 0.3, 0.45, 0.6) high-entropy alloys with eutectic microstructures were studied in different electrolyte solutions (0.6 M NaCl, 0.6 M Na<sub>2</sub>SO<sub>4</sub>, and 0.6 M H<sub>2</sub>SO<sub>4</sub>). The potentiodynamic polarisation test showed that the pitting potential of Nb0.45 alloy reached 1.084V, and the alloy had the best corrosion resistance in Na<sub>2</sub>SO<sub>4</sub> solution. Mott Schottky tests and X-ray photoelectron spectroscopy tests on the Nb0.45 alloy, and it was found that different film forming mechanisms in neutral and acidic solutions. A double-layer passivation film mainly composed of Cr(OH)<sub>3</sub>, Cr<sub>2</sub>O<sub>3</sub>, and Nb<sub>2</sub>O<sub>5</sub> was formed. These studies provide basic theoretical reference for the preparation of new corrosion resistant high-entropy alloys.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108586"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095886","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}
IntermetallicsPub Date : 2025-02-01DOI: 10.1016/j.intermet.2024.108585
Chao Wang , Weihai Huang , Chunxue Yi , Minqiang Jiang , Hu Huang , Jiwang Yan
{"title":"Nanoindentation behavior of the laser-repaired CoCrFeNiV high-entropy alloy","authors":"Chao Wang , Weihai Huang , Chunxue Yi , Minqiang Jiang , Hu Huang , Jiwang Yan","doi":"10.1016/j.intermet.2024.108585","DOIUrl":"10.1016/j.intermet.2024.108585","url":null,"abstract":"<div><div>High-entropy alloys (HEAs) are solid-solution alloys composed of multiple elements, exhibiting excellent mechanical properties. The unique plastic deformation mechanism induced by their specific solid solution structures has attracted considerable attention but remains incompletely understood, particularly at the micro-scale. In this study, the surface morphology, chemical composition, and microstructures of CoCrFeNiV HEA before and after laser remelting repair were investigated. Nanoindentation testing was employed to characterize the surface hardness and creep behavior of the repaired surface. The distribution of surface hardness before and after laser remelting, as well as the indentation creep behavior under different loads, were studied. The mechanism of indentation creep on the repaired surface was discussed and analyzed. The effect of microstructures of HEAs, including precipitated phases and sub-grain boundaries, on dislocation-dominated micro-scale plastic deformation was elucidated by the transmission electron microscope (TEM). This study contributes to an in-depth understanding of the creep behavior and micro-scale deformation mechanisms in HEAs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108585"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095887","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}
IntermetallicsPub Date : 2025-01-31DOI: 10.1016/j.intermet.2025.108686
Seong-Woo Pak , Hiroaki Tatsumi , Jianhao Wang , Albert T. Wu , Hiroshi Nishikawa
{"title":"Interfacial reaction and IMC growth kinetics at the Bi2Te3/Ag interface during isothermal aging","authors":"Seong-Woo Pak , Hiroaki Tatsumi , Jianhao Wang , Albert T. Wu , Hiroshi Nishikawa","doi":"10.1016/j.intermet.2025.108686","DOIUrl":"10.1016/j.intermet.2025.108686","url":null,"abstract":"<div><div>Bonding materials that can withstand high operating temperatures are essential for increasing the conversion efficiencies of thermoelectric power-generation devices. Sn-based solders commonly used to join thermoelectric materials and electrodes have the disadvantage of limiting the maximum operating temperature to 150 °C because of their low melting point. To overcome this limitation, in the present study, Ag nanoparticle paste with high-temperature stability, low electrical resistivity, high thermal conductivity, and printability was used for bonding a Bi<sub>2</sub>Te<sub>3</sub> thermoelectric material and an electroless nickel immersion gold (ENIG)-plated Cu electrode.</div><div>We performed isothermal aging at 200 °C from 0 to 1000 h to analyze the microstructural and thickness changes in intermetallic compounds (IMCs). Initially, a heterogeneous distribution of the IMC layers was observed at the bonding interface; over time, the IMC structures became clearly distinct. The IMC thickness increased from ≤3.0 μm (initial) to 45.6 μm in 1000 h, growing by a factor of approximately 15.2. We analyzed the growth kinetics of AgTe and BiTe IMCs. The growth exponent <em>n</em> of the AgTe IMC was found to be 0.3, indicating grain boundary diffusion with grain-growth control, whereas the <em>n</em> value of the BiTe IMC was 0.5, which is consistent with volumetric diffusion-controlled growth. These differences in the growth behavior indicate that different diffusion mechanisms affect the reliability and performance of the bonding interface.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108686"},"PeriodicalIF":4.3,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
IntermetallicsPub Date : 2025-01-31DOI: 10.1016/j.intermet.2025.108685
H.B. Zhou , X.H. Jing , L. Yu , G. Ding , S.L. Cai , C.J. Shi , L.H. Dai , M.Q. Jiang , G. Wilde
{"title":"On the plasticity and inheritance in shear-band-rejuvenated metallic glasses","authors":"H.B. Zhou , X.H. Jing , L. Yu , G. Ding , S.L. Cai , C.J. Shi , L.H. Dai , M.Q. Jiang , G. Wilde","doi":"10.1016/j.intermet.2025.108685","DOIUrl":"10.1016/j.intermet.2025.108685","url":null,"abstract":"<div><div>Structural rejuvenation holds promise for enhancing the plastic deformability of metallic glasses. However, whether structural rejuvenation through the introduction of shear bands unequivocally leads to enhanced plasticity remains contentious. Herein, we investigated two metallic glasses with distinct initial energy states: as-cast and well-relaxed. These glasses underwent a 50 % thickness reduction through cold rolling. Cold rolling significantly reduces the plasticity of as-cast glasses but notably enhances plasticity along the rolling direction for annealed glasses. This underscores the dependence of plasticity in processed glasses on both the initial state and shear band distribution. Additionally, it was observed that cold-rolled glasses exhibit plastic anisotropy, and re-vitrified glasses remarkably inherit this behavior. Synchrotron X-ray diffraction analysis further revealed that the transformation from face-shared to edge-shared or vertex-shared medium-range orders plays a significant role in the plastic response of glasses. Our findings suggest that regulating shear band distribution, along with appropriate re-vitrification treatment, provides a promising strategy to tailor the structure and properties of metallic glasses.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108685"},"PeriodicalIF":4.3,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171713","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}
IntermetallicsPub Date : 2025-01-30DOI: 10.1016/j.intermet.2025.108681
Xiaofei Chen , Bin Tang , Beibei Wei , Xichuan Cao , Xiangyu Pan , Huiqin Wang , Guoming Zheng , Jinshan Li
{"title":"Study on recrystallization and phase transformation of Ti-43Al-4Nb-1Mo-0.2B alloy during the inter-pass annealing","authors":"Xiaofei Chen , Bin Tang , Beibei Wei , Xichuan Cao , Xiangyu Pan , Huiqin Wang , Guoming Zheng , Jinshan Li","doi":"10.1016/j.intermet.2025.108681","DOIUrl":"10.1016/j.intermet.2025.108681","url":null,"abstract":"<div><div>The multi-pass thermomechanical process is a common forming method employed for brittle metallic materials such as TiAl alloys, where complex recrystallization behavior and phase transformation are utilized to promote grain refinement and microstructural evolution. Thermal simulation compression experiments at 1200 °C/0.01 s<sup>−1</sup> were performed to investigate the recrystallization and phase transformation during inter-pass annealing. The results showed that a little dynamic recrystallization (DRX) preferentially occurred within the β<sub>o</sub>+γ mixed structures and along the boundaries of α<sub>2</sub>+γ lamellar colonies. Moreover, the inter-pass annealing had little effect on recrystallization of α<sub>2</sub> phase, but facilitated the α/α<sub>2</sub>→β/β<sub>o</sub> phase transformation to accelerate the fragmentation of α<sub>2</sub> lamellae. Also, the pre-deformed β<sub>o</sub> phase mainly underwent static recrystallization (SRX), which was enhanced with the increasing the proceeding-pass strain and inter-pass annealing duration. The recrystallization mechanisms of α<sub>2</sub> and β<sub>o</sub> phase were continuous recrystallizations, where nucleation inoculation or early nucleation induced the weak recrystallization texture similar to deformation texture in local regions, yet insufficient recrystallization eliminated the texture. The extension of annealing time at different strains was favorable for SRX of the γ phase, but meta-recrystallization (MDRX) could only occur in short-time annealing at high strains. Consequently, the design and optimization of multi-pass deformation process were proposed.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108681"},"PeriodicalIF":4.3,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182237","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}
IntermetallicsPub Date : 2025-01-30DOI: 10.1016/j.intermet.2025.108671
Tianlei Zhang , Kai Wang , Kailin Huang , Qingrong Yao , Zhao Lu , Qianxin Long , Jianqiu Deng , Jiang Wang , Huaiying Zhou
{"title":"Experimental investigation of isothermal section in the La-Ni-Si system at 1073 K","authors":"Tianlei Zhang , Kai Wang , Kailin Huang , Qingrong Yao , Zhao Lu , Qianxin Long , Jianqiu Deng , Jiang Wang , Huaiying Zhou","doi":"10.1016/j.intermet.2025.108671","DOIUrl":"10.1016/j.intermet.2025.108671","url":null,"abstract":"<div><div>The isothermal section of the La-Ni-Si ternary system at 1073 K has been constructed in this work by using X-ray diffraction (XRD), and back-scattered electron (BSE) mode equipped with an electron probe microanalysis (EPMA). The 17 ternary compounds have been confirmed in the isothermal sections at 1073 K: LaNi<sub>11.6–9.5</sub>Si<sub>1.4–3.5</sub>, LaNi<sub>8.8–8.4</sub>Si<sub>4.2–4.6</sub>, LaNi<sub>7.8–6.5</sub>Si<sub>5.2–6.5</sub>, LaNi<sub>2</sub>Si<sub>2</sub>, LaNiSi<sub>2</sub>, La<sub>2</sub>NiSi<sub>3</sub>, LaNiSi, La<sub>14</sub>Ni<sub>6</sub>Si<sub>11</sub>, La<sub>15</sub>Ni<sub>4</sub>Si<sub>13</sub>, LaNi<sub>9</sub>Si<sub>2</sub>, La<sub>2</sub>NiSi, La<sub>6</sub>Ni<sub>2</sub>Si<sub>3</sub>, LaNi<sub>4</sub>Si, La<sub>3</sub>Ni<sub>3</sub>Si<sub>2</sub>, La<sub>2</sub>Ni<sub>3</sub>Si<sub>2</sub>, LaNi<sub>2</sub>Si, and La<sub>2</sub>(Ni,Si). This isothermal section also consists of 44 + 6 three-phase regions. At 1073K, the maximum solid solubility of Si in the (Ni) phase is about 10.28 at.%, the maximum solid solubility of Si in the (LaNi<sub>5</sub>) phase is about 11.80 at.%, and the maximum solid solubility of Ni in the <em>β</em>-LaSi<sub>2</sub> phase is about 6.09 at.%. The present experimental results could be used as guidance to practical applications and input to future thermodynamic assessments.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108671"},"PeriodicalIF":4.3,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182236","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}
IntermetallicsPub Date : 2025-01-29DOI: 10.1016/j.intermet.2025.108678
Shi-chang Qiao , Na Li , Xin-yu Gao , Xin Wen , Feng-zhen Wang , Zhi-kang Xia , Yong-qiang Wang , Jin-zhe Jiang , Shuai Liu , Chao Yuan
{"title":"Low plastic deformation: Its impact on the microstructural evolution during heat treatment of nickel-based wrought superalloy GH4698","authors":"Shi-chang Qiao , Na Li , Xin-yu Gao , Xin Wen , Feng-zhen Wang , Zhi-kang Xia , Yong-qiang Wang , Jin-zhe Jiang , Shuai Liu , Chao Yuan","doi":"10.1016/j.intermet.2025.108678","DOIUrl":"10.1016/j.intermet.2025.108678","url":null,"abstract":"<div><div>A comprehensive investigation into the effects of low plastic deformation (LPD) at ambient temperature on the microstructural evolution of the nickel-based wrought superalloy GH4698 during solution heat treatment (SHT) was conducted. Applying 2%–10 % LPD to cylindrical specimens did not markedly alter the grain morphology. However, a portion of the initial annealing twin boundaries (TBs) would transform into other types of grain boundaries under the application of the stress field. Deformation microstructures with effective strains ranging from 0.025 to 0.042 (corresponding to the entire region of the 4 % deformed sample and the near-end region of the 6 % deformed sample) exhibited a pronounced increase in twin fraction during SHT, accompanied by the formation of multiple large twin-related domains (TRDs) and several abnormally large grains (ALGs). The occurrence of TRDs and their internal ALGs stems from the constrained nucleation of recrystallization and extensive twinning. The residual strain energy not alleviated through recrystallization, driven by thermal stress, initiates twin nucleation and promotes grain boundary migration. The emergence and disappearance of island-like twins, as well as twins terminating within grains, suggest that the introduced TBs include not only coherent TBs but also potentially highly mobile incoherent TBs during the evolution of TRDs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108678"},"PeriodicalIF":4.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181235","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}