Effects of sintering temperature on the microstructure evolution and mechanical properties of TiB2-20 wt% CoNi cermets

被引：8
作者：
Wu, Ning [1 ]
Xue, Fengdan [2 ]
He, Jiayi [2 ]
Luo, Kuangxin [2 ]
Luo, Fenghua [2 ]
机构：
[1] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China
[2] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2024年 / 988卷
关键词：
TiB 2-CoNi cermets; Sintering temperature; Microstructure evolution; Mechanical properties; Strengthening and toughening mechanisms; ULTRAHIGH STRENGTH; METALLIC GLASSES; PHASE EVOLUTION; COMPOSITES; BEHAVIOR; VACUUM; ALLOY;
D O I：
10.1016/j.jallcom.2024.174259
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Microstructure evolution and mechanical properties of TiB2-CoNi cermets at different sintering temperatures were investigated. A small amount of liquid phase appeared between 1362 degrees C and 1398 degrees C. Solid phase sintering mainly occurred below this temperature range, while liquid phase sintering mainly occurred above this temperature range. At around 1460 degrees C, dissolution and re-precipitation occurred around TiB2 particles due to liquid phase migration. Only TiB2 and CoNi phases were detected on XRD patterns at different sintering temperatures. As the sintering temperature increased, the relative density, fracture toughness, transverse fracture strength, and hardness of cermets increased, while their porosity decreased. The main influencing factors on the properties of cermets sintered at 1460 degrees C and above were the interface bonding strength and the grain size, while the porosity was the main influencing factor for cermets sintered below 1460 degrees C.
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页数：11
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