文献类型：期刊文献

英文题名：Shearing brittle intermetallics enhances cryogenic strength and ductility of steels

作者：Wang, Feng[1];Song, Miao[1];Elkot, Mohamed N.[2,3];Yao, Ning[4];Sun, Binhan[4];Song, Min[1];Wang, Zhangwei[1];Raabe, Dierk[2]

机构：[1]Cent South Univ, State Key Lab Powder Met, Changsha, Peoples R China;[2]Max Planck Inst Sustainable Mat, Dusseldorf, Germany;[3]Suez Univ, Dept Met & Mat Engn, Suez, Egypt;[4]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai, Peoples R China

年份：2024

卷号：384

期号：6699

起止页码：1017

外文期刊名：SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001253258000020)】；

基金：Min S. and Z.W. acknowledge support from National Key Research and Development Program of China (2022YFE0134400). Min S. acknowledges support from the Science and Technology Innovation Program of Hunan Province (no. 2022RC3035). Z.W. and Miao S. acknowledge the support from State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China. M.E. acknowledges the funding of DAAD and MoHE of Egypt to hisdoctoral studies through the GERLS program. Miao S. and Z.W.acknowledge the support from Double Cs-corrected TEM from the State Key Laboratory of Powder Metallurgy.

语种：英文

摘要：Precipitates are crucial for crafting mechanically strong metallic materials. In this work, we report the dislocation cutting of B2 (ordered body-centered cubic) nanoprecipitates, typically considered nonshearable intermetallics, in a lightweight compositionally complex steel during cryogenic tensile loading. Shearing is enabled by the high strength level for dislocation glide within the austenitic matrix, attributed to the substantial strengthening from subnanoscale local chemical ordering zones and the pronounced solid solution strengthening from the multiprincipal elements in the matrix. This mechanism not only harnesses the intense strengthening and strain hardening provided by otherwise impenetrable brittle nanoprecipitates but also introduces ductility through their sequential shearing with ongoing deformation. Our steel thus showcases ultrahigh cryogenic tensile strength up to 2 gigapascal at a remarkable tensile elongation of 34%. This study reveals a new strategy for designing high-performance structural materials.