Abstract
The high strength is a typical advantage of body-centered-cubic high-entropy alloys(BCC-HEAs).How-ever,brittleness and weak strain-hardening ability are still their Achilles'heel.Here,extraordinary strength together with good tensile ductility are achieved in(Zr0.5Ti0.35Nb0.15)100-xAlx alloys(at.％,x=10 and 20)at room temperature.Relatively low densities of less than 6 g/cm3 are exhibited in these alloys.Designing nanoprecipitates and diversifying dislocation motions are the keys to achieving such salient breakthrough.It is worth noting that the tensile strength of 1.8 GPa in(Zr0.5Ti0.35Nb0.15)80Al20 alloy is a record-high value known in reported BCC-HEAs,as well as a tensile strain over 8％.Furthermore,the maximum strain of～25％in(Zr0.5Ti0.35Nb0.15)90Al10 alloy can challenge existing limit value,and is ac-companied with a tensile strength of 1.2 GPa.The current work does not only provide novel ultra-strong and tough structural materials with low density,but also sheds new light on designing BCC-HEAs with attractive performances and strain-hardening ability.
基金项目
国家自然科学基金(51671020)
Guangdong Basic and Applied Basic Research Foundation(2019B1515120020)
国家自然科学基金创新研究群体项目(51921001)
U.S.Army Office Project(W911NF-13-1-0438)
U.S.Army Office Project(W911NF-19-2-0049)
National Science Foundation(DMR-1611180)
National Science Foundation(1809640)
维普
万方数据