Influence of Hot-Rolling Deformation on Microstructure,Crystalline Orientation,and Texture Evolution of the Ti6Al4V-5Cu Alloy  

作　　者：Solomon Kerealme Yeshanew Chunguang Bai Qing Jia Tong Xi Zhiqiang Zhang Diaofeng Li Zhizhou Xia Rui Yang Ke Yang 

机构地区：[1]Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research(IMR),Chinese Academy of Sciences(CAS),Shenyang,110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang,110016,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2023年第8期1261-1280,共20页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51631009);the authors acknowledge the CAS-TWAS presidential scholarship program.

摘　　要：The influence of hot-deformation on the microstructure,crystalline orientation,and texture evolution of Ti6Al4V-5Cu,an antibacterial(α+β)titanium alloy,was investigated.The alloy was deformed using a hot rolling process in 15%,58%,and 73%thickness reduction ratios.It was found that the basal<α→>and pyramidal<c→+α→>type slip planes could be activated in theαphase,which dominated the deformation behavior of Ti6Al4V-5Cu alloy.Under various deformation conditions,the alloy revealed different microstructure features.On the 15%hot rolled alloy,the deformation was performed by the breakdown of priorβgrain boundaries(GBβ),which was attributed to the formation of coarseαgrains,rotated nearly 45°with respect to the transversal and rolling directions.The presence of different sub-structure geometries made the interior grain size distribution heterogeneous.On the 58%hot rolled alloy,Ti2Cu intermetallic compound was found at theα/βinterface.High-resolution transmission electron microscopy investigation showed the occurrence of grain rotation in different crystallographic directions.At room temperature,the percentage elongation(El)of the alloy reached 23.15%on the 58%hot rolled sample.On the 73%deformed alloy,refined and randomly oriented characteristics of grains were obtained due to higher thickness reduction,which resulted from the segregation of very fine granules.The influence of grain rotation during a hot rolling process revealed that theα/βtexture fiber separation angle to maintain the Burger orientation relationship of{0001}α//{110}βplanes decreased with increase of the thickness reduction ratio when Ti6Al4V-5Cu alloy was deformed by a hot rolling mechanism.Activation of tensile{1012}<1011>and compressive{1122}<1123>twins on the deformation of the alloy was also studied.

关 键 词：Ti6Al4V-5Cu Hot rolling Microstructure Texture evolution Twining 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG376[金属学及工艺—金属材料]