The Compressive Deformation Behavior and Deformation Mechanism of Ti14 Alloy in Semi-solid State  

作　　者：陈永楠 WANG Jiao WEI Jianfeng ZHAO Yongqing 

机构地区：[1]Engineering Research Center of Transportation Materials, Ministry of Education, School of Materials Science and Engineering, Chang'an University [2]State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiao Tong University [3]Northwest Institute for Nonferrous Metal Research

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第1期143-147,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.51201019);the Special Fund for Basic Scientific Research of Central Universities(No.2013G3314002)

摘　　要：The semi-solid deformation behavior of Til4 was investigated using compression tests at deformation temperatures between 1 273 and 1 423 K with strain rate of 5×10^-2 s^-1. Moreover, the fraction solid at different temperatures was also measured by image analysis. The results showed that the deformation temperature had strong effects on the flow stress, and the stress increased with the decrease of deformation temperature. The maximum stress depended greatly on the fraction solid, and a sharp decrease in stress occurred at a solid fraction between 0.94 and 0.98 （temperature from 1 323 to 1 373 K）. This decrease was related to the decrease in the amount of solid bridges between grains. Because of the partial solid/liquid segregation during deformation, the experimental strain rates were much lower than those calculated by the flow of liquid incorporating solid particles, which suggested that the main deformation mechanism between 1 323 and 1 373 K was still plastic deformation of solid particles.The semi-solid deformation behavior of Til4 was investigated using compression tests at deformation temperatures between 1 273 and 1 423 K with strain rate of 5×10^-2 s^-1. Moreover, the fraction solid at different temperatures was also measured by image analysis. The results showed that the deformation temperature had strong effects on the flow stress, and the stress increased with the decrease of deformation temperature. The maximum stress depended greatly on the fraction solid, and a sharp decrease in stress occurred at a solid fraction between 0.94 and 0.98 （temperature from 1 323 to 1 373 K）. This decrease was related to the decrease in the amount of solid bridges between grains. Because of the partial solid/liquid segregation during deformation, the experimental strain rates were much lower than those calculated by the flow of liquid incorporating solid particles, which suggested that the main deformation mechanism between 1 323 and 1 373 K was still plastic deformation of solid particles.

关 键 词：titanium alloy SEMI-SOLID microstructure MICROMECHANICS deformation mechanism 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TU411.5[金属学及工艺—金属材料]