A new insight into LPSO phase transformation and mechanical properties uniformity of large-scale Mg-Gd-Y-Zn-Zr alloy prepared by multi-pass friction stir processing

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外文摘要：A large-scale fine-grained Mg-Gd-Y-Zn-Zr alloy plate with high strength and ductility was successfully prepared by multi-pass friction stir processing(MFSP)technology in this work.The structure of grains and long period stacking ordered(LPSO)phase were characterized,and the mechanical properties uniformity was investigated.Moreover,a quantitative relationship between the microstructure and tensile yield strength was established.The results showed that the grains in the processed zone(PZ)and interfacial zone(IZ)were refined from 50 to 3 and 4 μm,re-spectively,and numerous original LPSO phases were broken.In IZ,some block-shaped 18R LPSO phases were transformed into needle-like 14H LPSO phases due to stacking faults and the short-range diffusion of solute atoms.The severe shear deformation in the form of kinetic ener-gy caused profuse stacking fault to be generated and move rapidly,greatly increasing the transformation rate of LPSO phase.After MFSP,the ultimate tensile strength,yield strength and elongation to failure of the large-scale plate were 367 MPa,305 MPa and 18.0％respectively.Grain refinement and LPSO phase strengthening were the major strengthening mechanisms for the MFSP sample.In particularly,the strength of IZ was comparable to that of PZ because the strength contribution of the 14H LPSO phase offsets the lack of grain refinement strengthening in IZ.This result opposes the widely accepted notion that IZ is a weak region in MFSP-prepared large-scale fine-grained plate.

外文关键词：

Friction stir processingMulti-passMg-Gd-Y-Zn-Zr alloyLPSO phase transformationMechanical properties

作者：

Xiaohu Guan、Wen Wang、Ting Zhang、Pai Peng、Qiang Liu、Peng Han、Ke Qiao、Jun Cai、Liqiang Wang、Kuaishe Wang

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作者单位：

School of Metallurgical Engineering,National and Local Joint Engineering Research Center for Functional Materials Processing,Xi'an University of Architecture and Technology,No.13 Yanta Road,Xi'an,Shaanxi 710055,China

Xi'an Rare Metal Materials Institute Co.Ltd,Xi'an 710016,China

State Key Laboratory of Metal Matrix Composites,School of Material Science and Engineering,Shanghai Jiao Tong University,No.800 Dongchuan Road,Shanghai 200240,China

基金：

National Key Research and Development Program of ChinaState Key Program of National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaKey Research and Development Program of Shaanxi ProvinceKey Research and Development Program of Shaanxi ProvinceShaanxi Province National Science Fund for Distinguished Young Scholars

项目编号：

2021YFB3501002520340551974220521043832021YFB37009022020ZDLGY13-062017ZDXM-GY-0372022JC-24

出版年：

2024

DOI：

10.1016/j.jma.2022.09.017

镁合金学报(英文)

ISSN：2213-9567

年,卷(期)：2024.12(5)