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《Journal of Materials Engineering》 2006-S1
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Study on Microstructures of TC21 Alloy Under Different Deformation Conditions

QU Heng-lei~(1),ZHAO Yong-qing~1,FENG Liang~1,XI Zheng-ping~1,LI Hui~1,XIA Yuan-ming~2(1 Northwest Institute for Nonferrous Metal Research,Xi′an 710016,China;2 University of Science and Technology of China,Hefei 230027,China)  
Hot compressing deformation tests of a new high strength and toughness titanium alloy TC21 based on Ti-Al-Sn-Zr-Mo-Cr-Nb-Si system were first carried out in the world.Single direction deformation characteristics of the alloy were investigated under eight different temperatures covering β phase region,β transus,and(α+β) phase region with five strain rates from 0.01s~(-1) to 50s~(-1).Observation and research on optical microstructure as deformed shows that microstructure inhomogeneity exists in different area of the samples,which is the result of deformation inhomogeneity.Both crystals coarsen and dynamic recrystallization may occur according to processing temperature selected.Grain diameter of the alloy could reach up to 100~200μm when(α+β)→β transformation were finished,while fine grains with size of less than 1~2 μm were discovered in some special region of samples processed at certain temperature within(α+β) region and strain rates.
【Fund】: 国家自然科学基金资助项目(50434030 10472110)
【CateGory Index】: TG115.21
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