Modification of microstructure and tensile property of TiBw/near-α Ti composites by tailoring TiBw distribution and heat treatment
Modification of microstructure and tensile property of TiBw/near-α Ti composites by tailoring TiBw distribution and heat treatment
复制标题
通过调整 TiBw 分布和热处理来改变 TiBw/近α Ti 复合材料的微观结构和拉伸性能
DOI：
10.1016/j.jallcom.2016.08.138
复制
发表时间：
2017-01-05
影响因子：
6.2
通讯作者：
Yu, Z. S.
中科院分区：
文献类型：
--
作者：
Wang, B.;Huang, L. J.;Yu, Z. S.
采用反应热压工艺制备了体积分数为5.1%的TiB晶须增强近α钛合金Ti60复合材料。为了改善其组织和性能，通过不变形热处理研究了析出相对所设计的网络结构复合材料的影响。显微组织分析结果表明，由于α稳定元素含量高和烧结后冷却速度慢，从基体中析出了尺寸为5 nm ~ 10 nm的有序α（2）相。时效处理可促进α相基体中α 2相和β相基体中硅化物的析出。特别地，沉淀物优选通过提供成核位点而在TiB晶须附近形成。在β转变温度以上进行固溶和淬火处理，随着固溶时间的延长，析出相逐渐溶解。固溶处理和时效处理均能提高合金的抗拉强度，其原因分别是马氏体α '相的形成和硅化物及α（2）相的析出。与Ti60合金相比，该复合材料对析出相的影响更为敏感。(C)2016爱思唯尔B. V.保留所有权利。
The 5.1 vol% TiB whisker reinforced Ti60 (near-alpha Ti alloy) composites were successfully fabricated by reaction hot pressing technology. In order to modify their microstructure and property, the effects of precipitates on the designed network structured composites were investigated by heat treatment without any deformation. The microstructure results show that the ordered alpha(2) phase with the size of 5 nm-10 nm is precipitated from matrix due to high content of alpha stabilizing elements and the slow cooling rate after sintering process. The aging treatment can promote the precipitation of alpha(2) phase in alpha phase matrix and the silicide in beta phase matrix. In particular, the precipitates prefer to be formed near the TiB whiskers by providing the nucleation sites. The solution and quenching treatment above the beta transus temperature can gradually dissolved these precipitates with increasing solution time. Both the solid solution and the aging treatment can improve the tensile strength of them due to the formation of martensite alpha' phase and precipitation of silicide and alpha(2), respectively. The composites exhibit more sensitive effect of precipitates on the room temperature embrittlement than the monolithic Ti60 alloy. (C) 2016 Elsevier B.V. All rights reserved.