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Nanostructured Ti29.7Ni50.3Hf20 high temperature shape memory alloy processed by high-pressure torsion

查看全文 作　　者：[1]A.Shuitcev;[2]D.V.Gunderov;[3]B.Sun;[1]L.Li;[2,4]R.Z.Valiev;[1]Y.X.Tong 高影响力作者 机构地区：[1]Institute of Materials Processing and Intelligent Manufacturing,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin,150001,China;[2]Institute of Physics of Advanced Materials,Ufa State Technical University of Aviation,Ufa,450000,Russia;[3]Center of Testing and Analysis,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin,150001,China;[4]Laboratory for Mechanics of Advanced Bulk Nanomaterials for Innovative Engineering Applications,Saint-Petersburg State University,Saint-Petersburg,199034,Russia高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2020年第52卷第17期,共8页高影响力期刊 基　　金：supported by National Key R&D Program of China[grant number 2017YFE0123500];National Natural Science Foundation of China[grant number 51971072,51671064];the Fundamental Research Funds for the Central University[grant number HEUCFG201836];the support from the RFBR-CNPq-DST research project№19-58-80018;the support in part from the Russian Foundation for Basic Research(project No.20-03-00614)。 摘　　要：High-pressure torsion(HPT)processing under a pressure of 6.0 GPa was applied to Ti29.7Ni50.3Hf20(at.%)alloy.Two types of structure were observed after HPT with 3 revolutions:first one is the mixture of amorphous phase and retained nanocrystalline;second is the alternating bands of amorphous phase and high defect density crystalline.As a result,post deformation annealing(PDA)at 500-700℃leads to the non-uniform distribution of martensite and parent phase grains.The grains of martensite are twice larger compared to that of parent phase.The nanocrystalline and ultrafine grains form after annealing at 500-600℃and 700℃,respectively.The twinning mechanism does not change with the reduction of martensitic grains up to^35 nm.The relationship between strength and grain size in Ti29.7Ni50.3Hf20 alloy obeys the classical Hall-Petch relationship with a coefficient of 10.80±0.39 GPa nm^1/2. 关 键 词：TiNiHf Nanocrystalline alloy Amorphous structure High-pressure torsion Hall-Petch relationship
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