Effect of Fe content on microstructures and properties of Ti6Al4V alloy with combinatorial approach  

扩散偶法研究Fe含量对Ti6Al4V组织和性能的影响（英文）

作　　者：Di WU Li-gang ZHANG Li-bin LIU Wei-min BAI Li-jun ZENG 吴迪;章立钢;刘立斌;白伟民;曾丽君(中南大学材料科学与工程学院,长沙410083;ZIK Virtuhcon, TU Bergakademie Freiberg;中南大学有色金属材料科学与工程教育部重点实验室,长沙410083)

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]ZIK Virtuhcon,TU Bergakademie Freiberg,Fuchsmühlenweg 9,D-09596 Freiberg,Germany [3]Key Laboratory of Non-ferrous Metallic Materials Science and Engineering of Ministry of Education,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第9期1714-1723,共10页中国有色金属学报（英文版）

基　　金：Project(2014CB644000)supported by the National Basic Research Program of China;Project(2016YFB0701301)supported by the National Key Technology R&D Program of China;Projects(51371200,51671218)supported by the National Natural Science Foundation of China;Project supported by State Key Laboratory of Powder Metallurgy,Central South University,China

摘　　要：A combinatorial approach was applied to investigating the influence of Fe content on the microstructures and properties of Ti6Al4V alloy.A diffusion couple was manufactured with Ti6Al4V and Ti6Al4V20Fe alloys and annealed at 1000°C for 600 h to obtain a wide range of compositions.By combining electron probe micro-analysis(EPMA),scanning electron microscopy(SEM)and nanoindentation,the relationships between composition and microstructure as well as hardness were determined.It is found that after aging the Ti6Al4V5Fe sample contains reasonable(about 55%)volume fraction of fineαphase and shows the peak hardness among the Ti6Al4VxFe alloys.Therefore,it is a promising candidate for the development of titanium alloys.HAADF-STEM and XRD reveal that after quenching from the singleβphase field,the metastableα''lamellae form in the Ti6Al4V5Fe alloy,and on subsequent isothermal aging,theα''lamellae become coarse and act as precursors/preferential nucleation sites for the stableαphase.采用扩散偶实验方法研究Fe含量对Ti6Al4V合金显微组织和性能的影响。通过制作Ti6Al4VTi6Al4V20Fe扩散偶,在1000°C经600h扩散退火,在一个样品内获得具有连续成分梯度的合金。结合电子探针、扫描电镜和纳米压痕,确定Ti6Al4VxF e合金成分-组织-硬度的关系。当合金中Fe含量增加到5%(质量分数)时,时效状态下合金中的α相体积分数降低到55%,同时合金具有最高的硬度,Ti6Al4V5Fe合金将是Ti6Al4Vx Fe体系中最具前景的合金。HAADF-STEM和XRD结果表明,Ti6Al4V5Fe合金在固溶淬火阶段生成纳米尺寸α''层片,这些亚稳的α''层片在随后的时效过程中逐渐长大,并作为α相的形核核心,形成稳定α相。

关 键 词：diffusion multiple Ti6Al4VxFe alloys COMPOSITION microstructure HARDNESS HAADF-STEM 

分 类 号：TG146.23[一般工业技术—材料科学与工程]