大尺寸TiAl/Ti_3Al微叠层超薄板制备和力学性能  

Preparation and Mechanical Properties of Large-sized TiAl/Ti_3Al Microlaminated Thin Sheets

作　　者：申造宇 黄光宏 何利民 牟仁德 李建平 SHEN Zao yu;HUANG Guang hong;HE Li min;MU Ren de;LI Jian ping(Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials,Beijing 100095, China)

机构地区：[1]中国航发北京航空材料研究院航空材料先进腐蚀与防护重点实验室,北京100095

出　　处：《材料工程》2018年第5期72-78,共7页Journal of Materials Engineering

摘　　要：采用电子束物理气相沉积(EB-PVD)制备大尺寸超薄TiAl/Ti_3Al微叠层复合材料。利用XRD和SEM对材料的微观结构与相组成进行分析;对热等静压处理前后的试样进行拉伸实验研究;同时,采用真空热处理的方法研究微叠层在不同温度下的结构演变和微叠层材料层状结构的退化机理。结果表明:微叠层具有明显的层状结构,由α_2-Ti_3Al和γ-TiAl相组成;经热等静压处理后的试样具有较高的抗拉强度和较好的伸长率,断裂方式由脆性断裂转变为具有一定韧性的解理断裂和脆性断裂的混合断裂方式;扩散温度和Al元素的浓度分布直接决定了微叠层的相结构与形貌的变化。Large sized TiA1/Ti3A1 multi layered composite thin sheet was prepared by electron beam physical vapor deposition lyzed by XRD and SEM. The breakdown of layere technology （EB PVD）. The phase composition and microstructu After hot isostatic pressing, samples were evaluated with static d structure was investigated by the high temperature annealing different temperature. The results show that the prepared material with visible composed of a2 Ti3A1 and 7 TiA1 phases. The sample after hot isostatic pressing strength and a good characteristic of tensile elongation. The fracture mode is tran fracture into a mixed mode consisting of intergranular fracture and ductile deformation fr ermore, the heat treatment temperature and the diffusion of A1 play a key role in the hology. re were ana tensile test. acture. Fur evolution of structure and morphology.

关 键 词：电子束物理气相沉积 TiA1/Ti3A1微叠层 微观结构 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]