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Breaking the trade off between corrosion resistance and fatigue lifetime of the coated Mg alloy through cold spraying submicron-grain Al alloy coatings

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Journal of Magnesium and Alloys 2024年第10期12卷 4229-4243页

作者： XiaoTao Luo YingKang Wei JiHao Shen Ninshu Ma Chang-Jiu Li State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’anShaanxi 710049China Joining and Welding Research Institute(JWRI) Osaka UniversityOsaka 567-0047Japan

Although magnesium(Mg)alloys are the lightest among structural metals,their inadequate corrosion resistance makes them difficult to be used in energy-saving lightweight ***,the improvement in corrosion resistance by the conventional surface treatments is always achieved at the expense of sacrificing the fatigue *** this study,high purity aluminum(Al)and AlMgSi alloy coatings were deposited on Mg alloys via an in-situ micro-forging(MF)assisted cold spray(MFCS)process for simultaneous higher corrosion resistance and longer fatigue *** contributing to a highly dense microstructure,the in-situ MF also greatly refines the grain of the deposited Al alloy coating to the sub-micrometer range due to the enhanced dynamic recrystallization and also generates notable compressive residual stress up to 210 MPa within the AlMgSi *** absence of secondary phases in the AlMgSi alloy coatings enable the coated Mg alloy with corrosion resistance,which is even better than its bulk AlMgSi *** unique combination of refined microstructure and the prominent compressive residual stress within the AlMgSi coatings,effectively delayed the crack initiation upon repeated dynamic loading,thereby leading to∼10 times increase in the fatigue lifetime of the Mg ***,although residual stress is also generated in the submmicro-sized grained pure Al coating,the low intrinsic strength of the coating layer leads to a lower fatigue lifetime than the uncoated Mg alloy *** present work is aimed to provide a facile approach to break the trade-off between corrosion resistance improvement and fatigue lifetime of the coated Mg alloys.

关键词： Magnesium alloys Aluminum alloy coating submicron grain Corrosion performance Fatigue lifetime.

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FABRICATION OF submicron grainED TITANIUM ALLOY BY COMPRESSIVE DEFORMATION

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 638-644页

作者： X. J. Sun, J. L. Gu, B. Z. Bai, B. Dai and N. P. Chen (Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

This paper reviews various fabrication methods of ultrafine grained materials and their limitations briefly, and examines the possibility to produce ultrafine grained titanium alloy by compressive deformation preliminarily. It has been shown that submicrongrained TC11 alloy can be obtained by compressive deformation below 725°C. During microstructure refinement, dynamic recrystallization occurs only in α phases, and β phases undergo a process of precipitation and growth. Compared with the situation of static annealing, deformation can not only enhance the precipitation and growth of β phases but also change the morphology of βprecipitates.

关键词： TC11 alloy submicron grain compressive deformation superplasticity

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