TiZrHfNb refractory high-entropy alloys with twinning-induced plasticity  

作　　者：Shubin Wang Da Shu Peiying Shi Xianbing Zhang Bo Mao Donghong Wang Peter.K.Liaw Baode Sun 

机构地区：[1]Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming and State Key Lab of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [3]Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen 518055,China [4]Department of Materials Science and Engineering,The University of Tennessee,Knoxville,TN,37996,USA

出　　处：《Journal of Materials Science & Technology》2024年第20期72-85,共14页材料科学技术（英文版）

基　　金：This work was supported by the National Natural Science Foun-dation of China(Nos.52301163 and 51821001);the National Key R&D Program of China(No.2022YFB3706800);P.K.Liaw very much appreciates the support from(1)the National Science Foun-dation(Nos.DMR-1611180,1809640,and 2226508);(2)the US Army Research Office(Nos.W911NF-13–1–0438 and W911NF-19–2–0049).

摘　　要：The twinning-induced plasticity(TWIP)effect has been widely utilized in austenite steels,β-Ti alloys,and recently developed face-centered-cubic(FCC)high-entropy alloys(HEAs)to simultaneously enhance the tensile strength and ductility.In this study,for the first time,the TWIP effect through hierarchical{332}<113>mechanical twinning has been successfully engineered into the TiZrHfNb refractory HEAs by decreasing temperature and tailoring the content of Nb to destabilize the BCC phase.At cryogenic tem-perature,the comprehensive hierarchical{332}<113>mechanical twins are activated in TiZrHfNb_(0.5) alloy from micro-to nanoscale and progressively segment the BCC grains into nano-scale islands during de-formation,ensuring sustainable strain hardening capability and eventually achieving a substantial 35%uniform tensile elongation.In addition,at 77 K,the tensile strength and uniform elongation of TiZrHfNbx alloys can further be adjusted by a moderate increase of Nb.The results above shed new light on the de-velopment of high-performance refractory HEAs with a high and adjustable strength and ductility com-bination down to the cryogenic temperature.

关 键 词：Refractory high-entropy alloys Cryogenic temperature Twinning induced plasticity Hierarchical twins Tensile properties 

分 类 号：TG14[一般工业技术—材料科学与工程]