IntermetallicsPub Date : 2025-02-12DOI: 10.1016/j.intermet.2025.108703
Z.B. Song , T.X. Huang , Aditya Jain , Y.G. Wang
{"title":"Effect of non-ferromagnetic element content on magnetic properties of FeCoMnAlSi high entropy alloy","authors":"Z.B. Song , T.X. Huang , Aditya Jain , Y.G. Wang","doi":"10.1016/j.intermet.2025.108703","DOIUrl":"10.1016/j.intermet.2025.108703","url":null,"abstract":"<div><div>High-entropy alloys have attracted considerable attention due to their advantages such as versatility and customizable properties. The customizable properties in soft magnetic high-entropy alloys mainly come from non-ferromagnetic elements, but it is challenging to maintain good soft magnetic properties while increasing the proportion of non-ferromagnetic elements. In this study, the ratio of non-ferromagnetic elements is systematically adjusted in the FeCoMnAlSi high-entropy alloy to explore its influence on soft magnetic properties. The structure of the alloys transforms in a sequence of FCC + BCC → BCC → BCC + B2 as the proportion of non-ferromagnetic elements increases. The soft magnetic properties of the system are significantly influenced by non-ferromagnetic elements. The dependence of saturation magnetization (<em>M</em><sub>s</sub>) on the proportion of non-ferromagnetic elements exhibits an И-shaped pattern, while that of coercivity (<em>H</em><sub>c</sub>) follows a V-shaped trend. Notably, the alloy (Fe<sub>4/5</sub>Co<sub>1/5</sub>)<sub>78</sub>(Mn<sub>10/23</sub>Al<sub>10/23</sub>Si<sub>3/23</sub>)<sub>22</sub> exhibits an exceptionally high <em>M</em><sub>s</sub> of 189.12 emu·g<sup>−1</sup> and a low <em>H</em><sub>c</sub> of 1.9 Oe. Simulation calculations indicated that the enhancement in <em>M</em><sub>s</sub> results from a reduction in the antiferromagnetic coupling between Fe and Mn, coupled with an improved efficiency of the ferromagnetic transformation in Mn.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108703"},"PeriodicalIF":4.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388129","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}
{"title":"The effect of microstructure evolution on the high-temperature mechanical properties and creep behavior of Y2O3-bearing alloy","authors":"Yingfei Guo , Wenjing Liang , Jiayan Zhou , Shulong Xiao , Lijuan Xu , Yu Liang , Yuyong Chen","doi":"10.1016/j.intermet.2025.108702","DOIUrl":"10.1016/j.intermet.2025.108702","url":null,"abstract":"<div><div>In this study, various heat treatment processes were employed to adjust the ratio of blocky γ phase to α<sub>2</sub>/γ lamellae and to create conditions conducive to the precipitation of Y<sub>2</sub>O<sub>3</sub> nanoparticles. The aim was to investigate the influence of microstructure evolution on the high-temperature mechanical properties and creep behavior of the Ti-48Al-2Cr-2Nb-0.05Y<sub>2</sub>O<sub>3</sub> alloy. As the holding temperature increases from 1200 °C to 1350 °C, the content of the blocky γ phase decreases from 61.49 % to 1.12 %, resulting in the formation of nearly duplex (NDP) microstructure, duplex (DP) microstructure, nearly lamellar (NL) microstructure, and fully lamellar (FL) microstructure. The combination of elevated temperature conditions and increased crystal defects promotes the precipitation of Y<sub>2</sub>O<sub>3</sub> nanoparticles, leading to the highest number of nanoscale reinforcements within the FL microstructure. As the heat-treated sample transitions from the NDP to FL microstructure, the ultimate tensile strength tested at 800 °C increases from 384 MPa to 668 MPa, while the creep life tested at 800 °C under 325 MPa improves from 10.8 h to 138.2 h. The elongation and creep strain initially increase and then decrease, with the heat-treated sample exhibiting an NL microstructure demonstrating the best high-temperature elongation of 21.48 % and the highest creep strain of 19.55 %. The favorable ductility and deformation capacity observed in the NL microstructure can be attributed to the cooperative deformation of the lamellar structure and its surrounding blocky γ phase. The excellent high-temperature strength and creep resistance of the FL microstructure result from the synergistic strengthening effect arising from a greater number of nanoscale Y<sub>2</sub>O<sub>3</sub> precipitates and the highest content of lamellar colonies, which provide an effective pinning effect on dislocation movement. In comparison to commonly used reinforcements, the heat-treated TiAl alloys reinforced with dual-scale Y<sub>2</sub>O<sub>3</sub> particles exhibit remarkable high-temperature properties, which are anticipated to further enhance the service temperature of TiAl alloys and expand their application at elevated temperatures.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108702"},"PeriodicalIF":4.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388130","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 : 2025-02-11DOI: 10.1016/j.intermet.2025.108690
Congqi Fu , Bowen Zhang , Xiaona Zhang , Lin Ge , Yumo Wen , Hui Li , Tao Yu , Chongyu Wang , Ze Zhang
{"title":"The strain field near the γ/γ′ interface in Ni-Al binary model single crystal superalloy","authors":"Congqi Fu , Bowen Zhang , Xiaona Zhang , Lin Ge , Yumo Wen , Hui Li , Tao Yu , Chongyu Wang , Ze Zhang","doi":"10.1016/j.intermet.2025.108690","DOIUrl":"10.1016/j.intermet.2025.108690","url":null,"abstract":"<div><div>The strain field near the γ/γ′ interface has a significant influence on the morphology evolution and the mechanical properties of Ni-based single crystal superalloys. The present work precisely determines the strain field near the γ/γ′ interface in a Ni-Al binary model single crystal superalloy by a combined usage of convergent beam electron diffraction (CBED) and high-resolution transmission electron microscopy (HRTEM) method. At positions slightly away from the γ/γ′ interface, the variation of lattice is sensitively measured by using standard CBED method. Within the range of about 10 nm close to the γ/γ′ interface, which is difficult to obtain a clear HOLZ pattern through traditional CBED solely, by using the CBED-calibrated HRTEM results, the complete lattice distortion and strain field are obtained. There is compressive strain in the γ′ phase and tensile strain in the γ phase, and the lattice strain affects a range as long as 80 nm near γ/γ′ interface. The strain distribution in the two phases is asymmetric, with the strain field in the γ phase obviously larger than in the γ′ phase. Our results provide important fundamental data for understands on the relationship between microstructure evolution and properties of Ni-based single crystal superalloys.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108690"},"PeriodicalIF":4.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388128","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}
{"title":"Phase dependence of the thermal memory effect in polycrystalline ribbon and bulk Ni55Fe19Ga26 Heusler alloys","authors":"A. Vidal-Crespo , A.F. Manchón-Gordón , J.M. Martín-Olalla , F.J. Romero , J.J. Ipus , M.C. Gallardo , J.S. Blázquez , C.F. Conde","doi":"10.1016/j.intermet.2025.108695","DOIUrl":"10.1016/j.intermet.2025.108695","url":null,"abstract":"<div><div>The thermal memory effect, TME, has been studied in Ni<sub>55</sub>Fe<sub>19</sub>Ga<sub>26</sub> shape memory alloys, fabricated as ribbons via melt-spinning and as pellets via arc-melting, to evaluate its dependence on the martensitic structure and the macrostructure of the samples. When the reverse martensitic transformation is interrupted, a kinetic delay in the subsequent complete transformation is only evident in the ribbon samples, where the 14M modulated structure is the dominant phase. In contrast, degradation of the modulated structure or the presence of the <span><math><mrow><mi>γ</mi></mrow></math></span> phase significantly reduces the observed TME. In such cases, the magnitude of the TME approaches the detection limits of commercial calorimeters, and only high-resolution calorimeter at very low heating rate (40 mK h<sup>−1</sup>) can show the effect. Following the kinetic arrest and subsequent cooling, the reverse martensitic transformation was completed at several heating rates to confirm the athermal nature of the phenomenon.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108695"},"PeriodicalIF":4.3,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373076","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 : 2025-02-05DOI: 10.1016/j.intermet.2025.108693
Dexiao Dong , Guoqiang Liu , Weimin Guo , Yu Zhang , Ning Ding , Long Liu , Na Xu , Lizong Chen , Yelong An , Yakai Bai
{"title":"The effect of heat-treatment on microstructure, wear resistance, and corrosion resistance of laser cladding AlCoCrFeNi2.1 high entropy alloy coating","authors":"Dexiao Dong , Guoqiang Liu , Weimin Guo , Yu Zhang , Ning Ding , Long Liu , Na Xu , Lizong Chen , Yelong An , Yakai Bai","doi":"10.1016/j.intermet.2025.108693","DOIUrl":"10.1016/j.intermet.2025.108693","url":null,"abstract":"<div><div>This study details the synthesis of an AlCoCrFeNi<sub>2.1</sub> high entropy alloy via laser cladding. The specimens are treated by heating them to 800 °C, 1000 °C, 1200 °C, and 1300 °C, respectively, holding them for an hour, and then cooling them in water. The purpose of the study is to explore the effect of high temperature heat treatment on the microstructural evolution and mechanical properties of the alloy. FCC + BCC dual phase microstructure was present in the samples before and after heat treatment. The microstructure was refined first, and then coarsened, as the temperature rose from 800 °C to 1300 °C. New BCC phase appeared in the initial FCC grains after treated at 800 °C, 1000 °C, and 1200 °C, and no new BCC phase was found in the coating heat treated at 1300 °C. Differences in the diffusion rates of Al, Co, Cr, Fe, and Ni atoms at elevated temperatures leads to an increase in size of the newly precipitated phases. The precipitation of BCC phase during high-temperature heat treatment is promoted by the significant negative mixing enthalpy between Al and Ni. At the optimal heat treatment temperature of 800 °C and 1000 °C, respectively, the sample exhibits optimal hardness and wear resistance. Its corrosion performance is also optimized at this temperature. Fatigue wear, bonding wear, oxidation wear, and abrasive wear are the wear mechanisms of as deposited and heat-treated samples. BCC phase, which is rich in Al & Ni, shows lower corrosion resistance and is preferentially corroded.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108693"},"PeriodicalIF":4.3,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143329882","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 : 2025-02-04DOI: 10.1016/j.intermet.2025.108692
Xuejian Lin, Hongjun Huang, Xiaoguang Yuan, Bowen Zheng, Xiaojiao Zuo, Ge Zhou, Kai Du
{"title":"Optimization and verification of hot tensile deformation parameters of Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy based on processing map theory","authors":"Xuejian Lin, Hongjun Huang, Xiaoguang Yuan, Bowen Zheng, Xiaojiao Zuo, Ge Zhou, Kai Du","doi":"10.1016/j.intermet.2025.108692","DOIUrl":"10.1016/j.intermet.2025.108692","url":null,"abstract":"<div><div>The high temperature tensile experiment of Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy was completed at 750–900 °C and strain rate of 10<sup>−5</sup>–10<sup>−3</sup> s<sup>−1</sup>. The processing map corresponding to the tensile process was established, and both optimal and instability zones were identified. The microstructure of different zones of processing map were observed in detail, and the justness of processing map was proved. The results show that the strain rate sensitivity index and energy dissipation rate increase with change of deformation conditions from low temperature/high stretching rate to high temperature/low stretching rate. The parameters of thermal tensile instability zone are: 750–795 °C/10<sup>−4</sup>–4 × 10<sup>−4</sup>s<sup>−1</sup> and 750–778 °C/10<sup>−4</sup>–10<sup>−5</sup>s<sup>−1</sup>. The optimal hot deformation parameters are as follows: the temperature is 880–900 °C and the strain rate is 2.5 × 10<sup>−4</sup>–10<sup>−5</sup>s<sup>−1</sup>. The obvious cracks and holes appear in the deformation structure corresponding to the instability zone, which are preferentially generated at the lamellar interface. The ratio of recrystallized structure corresponding to the optimal deformation parameter zone is higher than that in the instability zone, and the plastic deformation ability is greatly improved. The deformation characteristics of the instability zone are the dislocation pile-up, which is caused by the hindrance of the lamellar boundary and lamellar structure to the dislocation movement, and the substructure formed by the entanglement of the high-density dislocation regions in the lamellar structure. At the same time, there are also twins with a certain angle between the lamellar structure. The characteristics of deformation structure corresponding to the optimal deformation parameter region are dislocation, twin and recrystallization. The dislocation density in the recrystallized structure decreases, which can slow down the stress concentration inside the deformed structure, and the probability of instability such as cracks inside the alloy decreases.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108692"},"PeriodicalIF":4.3,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104024","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 : 2025-02-04DOI: 10.1016/j.intermet.2025.108689
Wei-Han Zhang , Tong Li , Yan Chen , Yuan-Yuan Tan , Hai-Ying Wang , Lan-Hong Dai
{"title":"A novel reactive high-entropy alloy with ultra-strong strain-rate effect","authors":"Wei-Han Zhang , Tong Li , Yan Chen , Yuan-Yuan Tan , Hai-Ying Wang , Lan-Hong Dai","doi":"10.1016/j.intermet.2025.108689","DOIUrl":"10.1016/j.intermet.2025.108689","url":null,"abstract":"<div><div>Reactive structural materials are crucial for energy exploitation and defense applications due to their outstanding energy release characteristics. However, traditional reactive structural materials often struggle to meet the required mechanical properties. In contrast, reactive high-entropy alloys that balance mechanical performance and energy release characteristics show great potential in this field. Here, we designed the active high-entropy alloy Ti<sub>50</sub>Zr<sub>25</sub>Hf<sub>12.5</sub>Nb<sub>12.5</sub>, at% using a metastable high-entropy alloy design strategy (“d-electron alloy” strategy). The alloy exhibits a single-phase BCC structure both before and after quasi-static tension, but undergoes an impact-induced ω phase transition during dynamic tension, resulting in an unprecedented increase in yield strength from 751 MPa to 1577 MPa (an increase of 110 %). Microstructural characterization revealed that the high-density dislocation walls resulting from the ω phase transition contribute to the significant strain-rate effect of the alloy. Furthermore, direct ballistic tests demonstrated that this novel active high-entropy alloy possesses excellent energy release characteristics (∼0.27 MPa assessed via Vented Chamber Calorimetry in 996 m/s direct ballistic test). This work sheds new light on designing reactive high entropy alloy with high dynamic strength may provide a mean to develop a wide range of advanced reactive structural materials.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108689"},"PeriodicalIF":4.3,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104029","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 : 2025-02-03DOI: 10.1016/j.intermet.2025.108691
Jingkuan Wang , Peng Li , Zhenyang Zhang , Xiong Ma , Yinchen Wang , Zhijie Ding , Honggang Dong
{"title":"Vacuum brazing of Ti2AlNb alloy with AgCu/Ti/AgCu sandwich filler metal.","authors":"Jingkuan Wang , Peng Li , Zhenyang Zhang , Xiong Ma , Yinchen Wang , Zhijie Ding , Honggang Dong","doi":"10.1016/j.intermet.2025.108691","DOIUrl":"10.1016/j.intermet.2025.108691","url":null,"abstract":"<div><div>An AgCu/Ti/AgCu sandwich filler metal was designed to achieve sound joining of Ti<sub>2</sub>AlNb alloy at low brazing temperature. The effects of brazing parameters on the microstructure, mechanical properties, and fracture behavior of the resultant joints were investigated. The typical microstructure of the joint was Ti<sub>2</sub>AlNb/AlCu<sub>2</sub>Ti + Nb<sub>(s, s)</sub>/Ag<sub>(s, s)</sub> + Cu<sub>(s, s)</sub> + Cu<sub>4</sub>Ti<sub>3</sub>/AlCu<sub>2</sub>Ti + Nb<sub>(s, s)</sub>/Ti<sub>2</sub>AlNb. With the increment of the brazing temperature and the holding time, the fracture paths were shifted from Zone Ⅰ to Zone Ⅱ and then to Zone Ⅰ. The shear strength of the joints indicated a trend of increasing and then sharply decreasing. The shear strength reached 292.67 MPa at 900 °C for 10 min, and the fracture morphology exhibited the mixed tough-brittle feature.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108691"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104023","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 : 2025-02-03DOI: 10.1016/j.intermet.2025.108684
Guangdong Wang , Tian Hua , Yinghao Liu , Yue Tian , Shuying Chen , Jingyi Cao , Yiran Zhou
{"title":"Effects of Mg content on fatigue behavior of wrought Al–8Si–(0.33–1.32)Mg alloy sheets in T4 temper","authors":"Guangdong Wang , Tian Hua , Yinghao Liu , Yue Tian , Shuying Chen , Jingyi Cao , Yiran Zhou","doi":"10.1016/j.intermet.2025.108684","DOIUrl":"10.1016/j.intermet.2025.108684","url":null,"abstract":"<div><div>In this paper, microstructure, fatigue life and fatigue fracture behavior of Al–8Si–(0.33–1.32)Mg (mass fraction, %) alloy sheets in T4 temper were systematically investigated by scanning electron microscopy/energy dispersive spectroscopy, electron backscatter diffraction, transmission electron microscopy and high frequency fatigue tests. The results show that when the stress ratio <em>R</em> = 0 and the stress level is 165 MPa, the fatigue properties of Al–8Si–(0.33–1.32)Mg alloy sheets in T4 temper first increase and then decrease with the increase of Mg content. When the Mg content is 0.78 %–0.99 %, the fatigue life is the longest, reaching 7.14 × 10<sup>5</sup>∼2.99 × 10<sup>6</sup> cycles. Fatigue cracks of Al–8Si–(0.33–0.99)Mg alloy sheets in T4 temper initiate at the persistent slip band. The fatigue crack initiation of Al–8Si–1.32Mg alloy sheet initiates at particles-associated aggregation area (PAA), and the fatigue initiation life of Al–8Si–1.32Mg alloy sheet is significantly shortened. PAA has little effect on tensile properties, but significant effect on fatigue properties. PAA can be regarded as a special defect affecting fatigue properties of materials. The stress concentration is the largest at particle orientation 0°. In addition, the smaller the particle spacing, the greater the stress concentration, the easier the crack initiation under applied load, when the particle spacing is greater than one particle spacing, the particle aggregation effect disappears. This study optimizes the fatigue behavior of high-silicon wrought aluminum alloy by controlling the Mg content and discovers a novel fatigue defect (PAA), providing important scientific insights for optimizing alloy properties and meeting diverse industrial needs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108684"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104028","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 : 2025-02-03DOI: 10.1016/j.intermet.2025.108683
Chengbao Wang , Wenhua Guo , Qianyu Ji , Yihui Zhang , Jiacheng Zhang , Bingheng Lu
{"title":"Microstructure and mechanical properties of FeCoNiCrTix high entropy alloys by selective laser melting","authors":"Chengbao Wang , Wenhua Guo , Qianyu Ji , Yihui Zhang , Jiacheng Zhang , Bingheng Lu","doi":"10.1016/j.intermet.2025.108683","DOIUrl":"10.1016/j.intermet.2025.108683","url":null,"abstract":"<div><div>The design idea of high entropy alloys (HEAs) has opened up a new era of alloy material science. Dense and crack-free FeCoNiCrTi<sub>x</sub> HEAs (X = 0,0.4, referred to as Ti<sub>0</sub>, Ti<sub>0.4</sub>) were prepared by selective laser melting (SLM). By varying the laser power and scanning speed, the effects of laser process parameters on the mechanism of porosity formation, densification, organization, weaving evolution and mechanical properties of HEA specimens were systematically investigated. The results show that with increasing laser power or decreasing scanning speed, the tissues exhibit epitaxial growth across multiple melt pool boundaries, with a slight enhancement of crystal orientation in the <001>BD direction. The Ti<sub>0.4</sub> HEAs possess the best mechanical properties, with microhardness 426.61 HV<sub>0.5</sub>, tensile strength 1355.49 MPa and elongation rate 7.54 %, respectively. The improved mechanical properties of Ti<sub>0.4</sub> HEA are mainly attributed to solid solution strengthening, fine grain strengthening (average grain size of about 4.2 μm) and discontinuous distribution of NiTi phase. The conclusions of the related studies provide an important theoretical basis for the selection of process parameters for the preparation of HEAs by SLM.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108683"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171712","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}