Deformation banding in β working of two-phase TA15 titanium alloy  

在β锻TA15两相钛合金中的变形带（英文）

作　　者：Xiao-guang FAN Xiang ZENG He YANG Peng-fei GAO Miao MENG Rui ZUO Peng-hui LEI 樊晓光;曾祥;杨合;高鹏飞;孟淼;左瑞;雷鹏辉(西北工业大学材料学院凝固技术国家重点实验室,西安710072)

机构地区：[1]State Key Laboratory of Solidification Processing, School of Materials Science and Engineering,Northwestern Polytechnical University, Xi’an 710072, China

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第11期2390-2399,共10页中国有色金属学报（英文版）

基　　金：Projects(51205317,51575449)supported by the National Natural Science Foundation of China;Project(50935007)supported by the National Natural Science Foundation of China for Key Program;Project(3102015AX004)supported by the Fundamental Research Funds for the Central Universities,China;Project(104-QP-2014)supported by the Research Fund of the State Key Laboratory of Solidification Processing,China

摘　　要：To study deformation banding inβworking of TA15titanium alloy,hot simulation compression experiments were carried out on a Gleeble3500thermal simulator,and the microstructure was investigated by optical microscopy(OM)and electron backscattered diffraction(EBSD).It is found that inβworking of TA15titanium alloy,deformation banding is still an important grain refinement mechanism up to temperature as high as0.7Tm(Tm is the melting temperature).Boundaries of deformation bands(DBBs)may be sharp or diffusive.Sharp DBBs retard discontinuous dynamic recrystallization(DDRX)by prohibiting nucleation,while the diffusive ones are sources of continuous dynamic recrystallization(CDRX).Deformation banding is more significant at high strain rate and large initial grain size.The average width of grain subdivisions is sensitive to strain rate but less affected by temperature and initial grain size.Multi-directional forging which produces crossing DDBs is potential to refine microstructure of small-size forgings.为了研究在β锻TA15两相钛合金中的变形带,在Gleeble 3500热模拟实验机上进行热模拟压缩试验,同时通过光学显微镜(OM)和电子背散射衍射(EBSD)对显微组织进行研究。研究发现:在TA15钛合金β变形中,变形带在温度高达0.7T_m(T_m为熔点)时仍是重要的组织细化机制。变形带的边界可以是尖锐或者连续变化的。尖锐的变形带界面能够阻碍不连续动态再结晶形核,从而抑制再结晶的发生,而连续变化的界面是连续动态再结晶产生之处。变形带在高应变速率和初始粗晶组织中更加明显。分裂后的晶粒宽度对应变速率敏感,但受温度和初始晶粒尺寸影响较小。多向锻造产生交织的变形带可用于细化小型锻件的组织。

关 键 词：TA15 titanium alloy β working deformation banding grain refinement dynamic recrystallization 

分 类 号：TG146.23[一般工业技术—材料科学与工程]