首页|Atomic-scale investigation of precipitate phases in QE22 Mg alloy

Atomic-scale investigation of precipitate phases in QE22 Mg alloy

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Precipitation-hardenable commercial Mg alloy QE22(Mg-2.5Ag-2.ONd-0.7Zr,wt.％)has excellent mechan-ical properties,but precipitates in this alloy have not been well understood.In this work,precipitate phases γ",γ,and δ formed during the isothermal ageing process at 150,200,250,and 300 ℃ have been characterized using atomic-resolution high-angle annular dark-field scanning transmission electron mi-croscopy and atomic-scale energy-dispersive X-ray spectroscopy.The morphology,crystal structure,and orientation relationship of these precipitate phases have been determined.Domain boundaries usually exist in a single γ particle,which can be characterized by a separation vector of[1(1)01]α.The δ phase forms in situ from its precursor γ phase,consequently leading to the formation of three different variants within a single 8 particle.The nucleation of the δ phase is strongly related to the domain boundaries of the y phase.The formation of the γ phase may be promoted by its precursor γ"phase.The similarities in atomic structures of the γ",γ,and δ phases are described and discussed,indicating that transfor-mations between these precipitate phases can be accomplished through the diffusion of added alloying elements.

Magnesium alloyPrecipitationPhase identificationPhase transformationElectron microscopy

Xiaojun Zhao、Zhiqiao Li、Aiping Zhang、Longlong Hao、Houwen Chen、Jian-Feng Nie

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Key Laboratory of Advanced Technologies of Materials,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China

International Joint Laboratory for Light Alloys(MOE),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

Department of Materials Science and Engineering,Monash University,Victoria 3800,Australia

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaSichuan Science and Technology ProgramFundamental Research Funds for the Central UniversitiesProject on Function Development of Largescale Instruments of Chongqing University

2021YFB0370210152071033521011502022YFG02872682021CX114gnkf2022017

2024

10.1016/j.jmst.2023.07.070

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)：2024.177(10)
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