首页|Gradient microstructure and superior strength-ductility synergy of AZ61 magnesium alloy bars processed by radial forging with different deformation temperatures

Gradient microstructure and superior strength-ductility synergy of AZ61 magnesium alloy bars processed by radial forging with different deformation temperatures

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
Gradient microstructure modification is a cost-efficient strategy for high strength without compromising ductility,which is urgently needed in the fundamental science of engineering materials.In this study,heterogeneous structures of AZ61 alloy bars with anisotropic gradients(with different grain size distribu-tions from the surface to the center)were observed to exhibit strong strength-ductility synergies under different deformation temperatures.The results reveal that the grain refinement process under medium-low temperature deformation conditions(≤ 350 ℃)consists of four transition stages along the radial direction,i.e.,twin activations and deformation band formations,dislocation cells and pile-ups,ultra-fine sub-grains,and randomly orientated quasi-micron grains.Different deformation temperatures have a great influence on twin activations and deformation band formations,and the high temperature can easily provoke the initiation of non-basal slip.The deformation bands were determined as a primary nucleation site due to their highly unstable dislocation hindrance ability.Analysis in combination with the Radial forging(RF)deformation process,the differences of dynamic precipitates can be attributed to microstructural difference and solubility limit of Al at different temperatures.By summarizing the ten-sile test results,the sample forged at 350 ℃ exhibited the best strength-ductility synergy,exhibiting the highest elongation(EL)of 23.2％with a 251 MPa yield strength(YS)and 394 MPa ultimate tensile strength(UTS)in center region,and combined with the highest strength value of 256 MPa YS and 420 MPa UTS in the center region,while the EL was slightly degraded to 19.8％.

Gradient microstructureRadial forgingStrength-ductility synergyMagnesium alloyStrengthening mechanism

Jingfeng Zou、Lifeng Ma、Yanchun Zhu、Ling Qin、Yuan Yuan

展开 >

School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China

Heavy Machinery Engineering Research Center of the Ministry Education,Taiyuan University of Science and Technology,Taiyuan 030024,China

Department of Engineering,University of Hull,Cottingham Rd,Hull HU6 7RX,UK

National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China

展开 >

国家自然科学基金国家自然科学基金中国博士后科学基金Fundamental Research Program of Shanxi ProvinceTechnological Innovation Talent Team Special Plan of Shanxi ProvinceDoctoral Starting up Foundation of Taiyuan University of science and Technology

U1910213522054002021M69262620220302121232120220405100200220222046

2024

10.1016/j.jmst.2023.07.003

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.170(3)
  • 49