Controllable two-scale network architecture and enhanced mechanical properties of (Ti5Si3+TiBw)/Ti6Al4V composites

被引：38
|
作者：
Jiao, Y. [1 ]
Huang, L. J. [1 ,2 ]
Duan, T. B. [1 ]
Wei, S. L. [1 ]
Kaveendran, B. [1 ]
Geng, L. [1 ,2 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, POB 433, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, State Key Lab Adv Welding & Joining, POB 433, Harbin 150001, Peoples R China
来源：
SCIENTIFIC REPORTS | 2016年 / 6卷
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
THERMAL-STABILITY; HEAT-TREATMENT; SI ADDITION; MICROSTRUCTURE; BEHAVIOR; TI5SI3; ALLOYS; PHASE; PRECIPITATION; EVOLUTION;
D O I：
10.1038/srep32991
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Novel Ti6Al4V alloy matrix composites with a controllable two-scale network architecture were successfully fabricated by reaction hot pressing (RHP). TiB whiskers (TiBw) were in-situ synthesized around the Ti6Al4V matrix particles, and formed the first-scale network structure (FSNS). Ti5Si3 needles (Ti5Si3) precipitated in the beta phase around the equiaxed a phase, and formed the secondary-scale network structure (SSNS). This resulted in increased deformation compatibility accompanied with enhanced mechanical properties. Apart from the reinforcement distribution and the volume fraction, the ratio between Ti5Si3 and TiBw fraction were controlled. The prepared (Ti5Si3 + TiBw)/Ti6Al4V composites showed higher tensile strength and ductility than the composites with a one-scale microstructure, and superior wear resistance over the Ti6Al4V alloy under dry sliding wear conditions at room temperature.
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页数：10
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