Design of refractory multi-principal-element alloys for high-temperature applications  

作　　者：Gaoyuan Ouyang Prashant Singh Ranran Su Duane D.Johnson Matthew J.Kramer John H.Perepezko Oleg N.Senkov Daniel Miracle Jun Cui 

机构地区：[1]Division of Materials Science and Engineering,Ames Laboratory,Ames,IA 50011,USA [2]Department of Materials Science and Engineering,University of Wisconsin-Madison,Madison,WI 53706,USA [3]Department of Materials Science and Engineering,Iowa State University,Ames,IA 50011,USA [4]Air Force Research Laboratory,Materials and Manufacturing Directorate,Wright-Patterson Air Force Base,Dayton,OH 45433,USA

出　　处：《npj Computational Materials》2023年第1期884-893,共10页计算材料学（英文）

基　　金：This work was supported by the U.S.Department of Energy(DOE),Office of Energy Efficiency&Renewable Energy,and Advanced Manufacturing Office under project AOP 2.1.0.19;Theoretical methods to address complex solid solutions were developed with support from the DOE Office of Science,Basic Energy Sciences,Materials Science&Engineering Division.Funding was in part from Laboratory Directed Research and Development funds through Ames Laboratory.Ames Laboratory is operated by Iowa State University for the U.S;DOE,Office of Science,Office of Basic Energy Sciences under contract DE-AC02-07CH11358;Work by O.S.was supported through the Air Force on-site contract FA8650-21-D-5270 managed by MRL Materials Resources LLC,Xenia,OH,USA.We acknowledge Vinay Deodeshmukh at Haynes International for providing us with the Haynes 282 alloy and relevant heat treatment conditions for this alloy。

摘　　要：Refractory multi-principal-element alloys(RMPEAs)exhibit high specific strength at elevated temperatures(T).However,current RMPEAs lack a balance of room-temperature(RT)ductility,high-T strength,and high-T creep resistance.Using density-functional theory methods,we scanned composition space using four criteria:(1)formation energies for operational stability:-150<E_(f)≤+70 meV per atom;(2)higher strength found via interstitial electron density with Young’s moduli E>250 GPa;(3)inverse Pugh ratio for ductility:G/B<0.57;and(4)high melting points:T_(m)>2500°C.Using rapid bulk alloy synthesis and characterization,we validated theory and down-selected promising alloy compositions and discovered Mo72.3W12.8Ta10.0Ti2.5Zr2.5 having well-balanced RT and high-T mechanical properties.This alloy has comparable high-T compressive strength to well-known MoNbTaW but is more ductile and more creep resistant.It is also superior to a commercial Mo-based refractory alloy and a nickel-based superalloy(Haynes-282)with improved high-T tensile strength and creep resistance.

关 键 词：CREEP ALLOY ALLOYS 

分 类 号：TG13[一般工业技术—材料科学与工程]