Preparation of high-mechanical-property medium-entropy CrCoNi alloy by asymmetric cryorolling  

深冷异步轧制制备高力学性能CrCoNi中熵合金

作　　者：Yu-ze WU Zhao-yang ZHANG Juan LIU Charlie KONG Yu WANG Puneet TANDON Alexander PESIN Hai-liang YU 吴雨泽;张朝阳;刘娟;Charlie KONG;Yu WANG;Puneet TANDON;Alexander PESIN;喻海良(中南大学高性能复杂制造国家重点实验室,长沙410083;中南大学机电工程学院,长沙410083;中南大学轻合金研究院,长沙410083;Mark Wainwright Analytical Centre,University of New South Wales,Sydney,NSW 2052,Australia;PDPM Indian Institute of Information Technology,Design and Manufacturing,Jabalpur 482005,India;Laboratory of Mechanics of Gradient Nanomaterials,Nosov Magnitogorsk State Technical University,Magnitogorsk 455000,Russia)

机构地区：[1]State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha 410083,China [2]College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China [3]Light Alloys Research Institute,Central South University,Changsha 410083,China [4]Mark Wainwright Analytical Centre,University of New South Wales,Sydney,NSW 2052,Australia [5]PDPM Indian Institute of Information Technology,Design and Manufacturing,Jabalpur 482005,India [6]Laboratory of Mechanics of Gradient Nanomaterials,Nosov Magnitogorsk State Technical University,Magnitogorsk 455000,Russia

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第5期1559-1574,共16页中国有色金属学报（英文版）

基　　金：supported by the Hunan High-Tech Industry Science and Technology Innovation Leading Plan,China(No.2020GK2032);the Huxiang High-Level Talent Gathering Project of Hunan Province,China(No.2018RS3015);the Innovation Driven Program of Central South University,China(No.2019CX006);the Research Fund of the Key Laboratory of High Performance Complex Manufacturing at Central South University,China。

摘　　要：In order to obtain good strength−plasticity synergy for a medium entropy alloy(MEA)CrCoNi,cold rolling,asymmetric rolling,cryorolling and asymmetric-cryorolling with subsequent annealing at different temperatures were conducted.The results showed that the asymmetric-cryorolled alloy achieved a high strength of over 1.6 GPa.After annealing at 1073 K,it retained a high strength of~1 GPa while the elongation reached nearly 60%.After annealing,the heterogeneous characteristics were formed in asymmetric-cryorolled samples,which were found to be more distinct than those of the samples subjected to asymmetric rolling.This resulted in the generation of high strength and ductility.为了获得具有更好强塑性平衡的CrCoNi中熵合金,采用冷轧、异步轧制、深冷轧制和深冷异步轧制4种工艺对中熵合金CrCoNi进行加工,并对合金进行不同温度的退火处理。研究结果表明:深冷异步轧制的合金获得超过1.6 GPa的高强度,当经过1073 K的退火处理后,在具有接近60%的伸长率的同时,仍然保留接近1 GPa的强度。采用深冷异步轧制和退火后,得到较室温异步轧制更为明显的异质特征,这使材料具有更高的强度与更好的塑性。

关 键 词：medium entropy alloy heterogeneous structure ANNEALING mechanical properties asymmetric cryorolling 

分 类 号：TG335[金属学及工艺—金属压力加工] TG139[一般工业技术—材料科学与工程]