文献类型：期刊文献

英文题名：Deformation-induced concurrent formation of 9R phase and twins in a nanograined aluminum alloy

作者：Zhang, Jingfan[1];Zhou, Dengshan[1,2];Pang, Xueyong[1];Zhang, Bowen[1];Li, Yue[3];Sun, Binhan[4];Valiev, Ruslan Z.[5,6];Zhang, Deliang[1,2]

机构：[1]Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China;[2]Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China;[3]Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany;[4]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[5]Ufa State Aviat Tech Univ, Ufa 450008, Russia;[6]St Petersburg State Univ, St Petersburg 198504, Russia

年份：2023

卷号：244

外文期刊名：ACTA MATERIALIA

收录：;EI(收录号：20230113345004);WOS:【SCI-EXPANDED(收录号:WOS:000976833000001)】；

基金：DSZ would like to thank the financial support from the Natural Science Foundation of China (Grant No.: 51701036). YL acknowledges the research fellowship provided by the Alexander von Humboldt Foundation. DLZ acknowledges the financial support from "Xing Liao Talent Plan" of Liaoning Province, China (Grant No.: XLYC1802080). RZV acknowledges the financial support from Russian Science Foundation (Grant No.: 22-19-00445) for his part of studies. Prof. Yuntian Zhu from The City University of Hong Kong, China, is acknowledged for the stimulating discussion. We thank U. Tezins, A. Sturm, and C. Bro beta, for their technical support at the FIB and APT facilities at MPIE. Special thanks are due to the instrumental/data analysis from Analytical and Testing Center, Northeastern University.

语种：英文

外文关键词：Mechanical alloying; Nanograined Al alloys; Stacking fault energy; Deformation twinning; 9R phase

摘要：Twins and 9R phase (a structure containing a high density of stacking faults) have played important roles in simultaneously improving strength and strain hardening capacity of low-to-medium stacking fault energy (SFE, smaller than 50 mJ/m2) metallic materials. Due to the high SFE (166 mJ/m2) in pure face-centered-cubic Al and its insensitivity to most soluble alloying elements, concurrent introduction of deformation twins and 9R phase into an originally twin-free Al alloy is intuitively impossible. Here, we propose a strategy to simultaneously produce deformation twins and 9R structure in an Al-Mg alloy by nanostructuring grain sizes and alloying with Y. We demonstrate that plastic deformation of the nanograined Y-doped Al-Mg alloy can concurrently drive the dissociation of incoherent twin boundaries and direct emission of grain boundary Shockley partial dislocations, enabling the development of two different 9R structures in the nanograined Al-Mg-Y alloy. Our strategy combining grain size nanostructuring and SFE tuning presents a new microstructure design in strengthening bulk Al alloys by planar defects of deformation twins and 9R structure and/or stacking faults.