Novel Co-free high performance TRIP and TWIP medium-entropy alloys at cryogenic temperatures  

作　　者：Ran Wei Kaisheng Zhang Liangbin Chen Zhenhua Han Tan Wang Chen Chen Jianzhong Jiang Tingwei Hu Fushan Li 

机构地区：[1]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [2]College of Physics and Electronic Engineering,Xinyang Normal University,Xinyang 464000,China [3]School of Materiab Science and Engineering,Xi'an University of Technology,Xi'an,710048,China [4]International Center for New-Structured Materials(1CNSM),Laboratory of New-Structured Materials,State Key Laboratory of Silicon Materials,and School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China [5]Key Laboratory of Tropical Translational Medicine of Ministry of Education/School of Tropical Medicine and Laboratory Medicine,Hainan Medical University,Haikou 571199,China

出　　处：《Journal of Materials Science & Technology》2020年第22期153-158,共6页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. U1832203, 11975202, U1704159 and 51701183);the Key Research & Development and Promotion of Special Project of Henan Province (Science & Technology) (No. 192102210006)。

摘　　要：Recently,high-and medium-entropy alloys(HEAs and MEAs) have been found to exhibit excellent cryogenic mechanical properties,but most of them contain high-priced Co element.Therefore,developing HEAs or MEAs with high strength and ductility and relatively low cost is urgent.In this work,novel Cofree Fex Mn(75-x) Ni(10)Cr(15)(x=50 and 55 at.%) MEAs were developed,which exhibit a good combination of low cost,high strength and ductility at cryogenic temperature.It was found that the Fe(50)Mn(25)Ni(10)Cr(15)MEA exhibits a combination of cryogenic tensile strength of^0.98 GPa and ductility of^83 %.The excellent cryogenic mechanical properties were attributed to joint of twinning-induced plasticity(TWIP) and transformation-induced plasticity(TRIP) effects.The present study sheds light on developing low cost MEAs with high perfo rmance for cryogenic-tempe rature applications.

关 键 词：Medium-entropy alloys(MEAs) Transformation-induced plasticity(TRIP) Twinning induced plasticity(TWIP) Mechanical properties Cryogenic temperature 

分 类 号：TG139[一般工业技术—材料科学与工程]