Additive manufacturing of Cu-AI-Mn shape memory alloy with enhanced superelasticity  

作　　者：Meng-Wei Wu Zhuo-Fan Hu Bing-Bing Yang Ying Tao Rui-Ping Liu Chun-Mei Ma Lei Zhang 

机构地区：[1]Department of Materials Science and Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China [2]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China [4]Department of Mechanical Engineering,University of Alaska Fairbanks,Fairbanks 99775-5905,USA

出　　处：《Rare Metals》2023年第12期4234-4245,共12页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.52272258);Fundamental Research Funds for the Central Universities (No.2023ZKPYJD07);Key R&D and transformation projects in Qinghai Province (No.2021-HZ-808)and Hebei Province (No.21314401D);American Chemical Society Petroleum Research Fund for the support (No.PRF-59722-ND10)。

摘　　要：The Cu-based shape memory alloy(SMA)with highly oriented columnar crystals is an ideal candidate for the commercial application,especially the ones obtained through rapid cooling via additive manufacturing method.In this work,Cu_(71)Al_(18)Mn_(11)(at%)shape memory alloy with strong<001>texture columnar grains was successfully prepared by selective laser melting(SLM).An L27(313)orthogonal array was designed to systematically investigate the effects of laser power,scanning speed,scanning spacing,layer thickness and their interactions on the forming quality of Cu_(71)Al_(18)Mn_(11)alloys.Cu_(71)Al_(18)Mn_(11)alloys with density of 7.3204 g·cm^(-3)and relative density of 99.18%were successfully prepared when the laser power,scanning speed,scanning distance and layer thickness were 240 W,1000 mm·s^(-1),0.11 mm and 25μm,the transformation onset temperature(Ms),martensite phase transformation termination temperature(Mf),austenite phase transformation onset temperature(AS)and austenite phase transformation termination temperature(Af)are-21.84,-26.04,-15.75 and-12.36℃,respectively.The compression strength and fracture strain along the building direction(BD)were significantly superior to the scanning direction(SD),while the superelasticity of compression along the SD reached 2.50%,which was better than that of2.32%along BD.The mechanical property and superelasticity anisotropy due to the formation of columnar grains and texture were discussed.This study shows that SLM is a proposed method for the preparation of Cu-Al-Mn SMAs with high superelasticity,which provides a new strategy for enhancing the shape memory alloy superelasticity.

关 键 词：Shape memory alloy(SMA) Selective laser melting(SLM) Columnar grains Superelasticity properties 

分 类 号：TG139.6[一般工业技术—材料科学与工程]