Superplastic tensile characteristics of in situ TiBw/Ti6Al4V composites with novel network microstructure
Superplastic tensile characteristics of in situ TiBw/Ti6Al4V composites with novel network microstructure
复制标题
新型网络微观结构原位TiBw/Ti6Al4V复合材料的超塑性拉伸特性
DOI：
10.1016/j.msea.2013.05.076
复制
发表时间：
2013-10-01
期刊：
影响因子：
6.4
通讯作者：
Wu, L. Z.
中科院分区：
文献类型：
--
作者：
Huang, L. J.;Zhang, Y. Z.;Wu, L. Z.
通过对TiBw/Ti64复合材料进行网络组织的剪裁，制备了原位TiB晶须增强Ti6 Al 4V（TiBw/Ti64）复合材料，改善了钛基复合材料（TMCs）的强韧化效果。复合材料的超塑性拉伸变形在900-1000 ℃和0.0005-0.01 s（-1）下进行。结果表明，该复合材料在940 ℃时的拉伸伸长率超过100%，最高可达214%。新型复合材料的应变速率敏感性（m）和激活能（Q）分别为0.25和338 kJ/mol。这些现象表明，新型复合材料具有改善的变形能力。TiBw/Ti 64复合材料的超塑性主要归因于新型的网状组织，这种网状组织通过抑制局部变形、降低裂纹扩展速率和细化晶粒而产生上级变形能力。皇冠版权所有（c）2013由爱思唯尔B. V.出版保留所有权利。
In situ TiB whiskers reinforced Ti6Al4V (TiBw/Ti64) composites were fabricated by tailoring a novel network microstructure-which improved the strengthening and toughening effects of titanium matrix composites (TMCs). Superplastic tensile deformation of the composites was carried out at 900-1000 degrees C and 0.0005-0.01 s(-1). The results showed that the tensile elongation of the novel composites is over 100%, even up to 214% at 940 degrees C. The strain rate sensitivity (m) and the activation energy (Q) of the novel composites are 0.25 and 338 kJ/mol, respectively. These phenomena indicate that the novel composites possess an improved deformability. The superplasticity of the TiBw/Ti64 composites can be attributed to the novel network microstructure, which can induce superior deformability by inhibiting local deformation, decreasing crack propagation rate and refining grain size. Crown Copyright (c) 2013 Published by Elsevier B.V. All rights reserved.