Hot deformation behavior of nano-sized TiB reinforced Ti-6Al-4V metal matrix composites

被引：18

作者：

Cao, Yuankui ^{[1
]}

Liu, Yong ^{[1
]}

Li, Yunping ^{[1
]}

Liu, Bin ^{[1
]}

Xu, Rongjun ^{[1
]}

机构：

[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

来源：

MECHANICS OF MATERIALS | 2020年 / 141卷 / 141期

基金：

湖南省自然科学基金; 国家杰出青年科学基金;

关键词：

Titanium; Metal matrix composite; Hot deformation; Microstructure; Processing map; MICROSTRUCTURAL EVOLUTION; TENSILE PROPERTIES; MECHANICAL-PROPERTIES;

D O I：

10.1016/j.mechmat.2019.103260

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In situ Ti-6Al-4V/TiB composites with different contents of TiB were prepared by SPS. The flow behavior of the composites deformed at temperatures of 900-1200 degrees C and strain rates of 0.001 to 10 s(-1) was studied. The constitutive equations and processing maps were established. Results show that the composites have fine microstructures, and nano-sized TiB whiskers distribute homogeneously in the alpha + beta titanium matrix. The activation energy of the composites is low due to the fine microstructures, resulting in a good workability. The processing maps suggest that the instable deformation occurs at low temperatures and high strain rates. The flow localization band of Ti matrix, cracking and debonding of TiB whiskers are the reasons for the instable deformation. Dynamic recrystallization has been found in composites deformed at low strain rates, accounting for the stable deformation.

引用

页数：9

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