Formation of Fine B2/β plus O Structure and Enhancement of Hardness in the Aged Ti2AlNb-Based Alloys Prepared by Spark Plasma Sintering

被引：20
|
作者：
Li, Mengchen [1 ]
Cai, Qi [1 ]
Liu, Yongchang [1 ]
Ma, Zongqing [1 ]
Wang, Zumin [1 ]
Huang, Yuan [1 ]
Li, Huijun [1 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300354, Peoples R China
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2017年 / 48A卷 / 09期
基金：
国家高技术研究发展计划(863计划); 中国国家自然科学基金;
关键词：
ORTHORHOMBIC TITANIUM ALUMINIDE; AL-NB SYSTEM; MICROSTRUCTURAL STABILITY; HEAT-TREATMENT; PHASE; TRANSFORMATIONS; EVOLUTION; TENSILE; DEFORMATION; COMPOSITES;
D O I：
10.1007/s11661-017-4193-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ti2AlNb-based alloys synthesized at 1223 K (950 A degrees C) by spark plasma sintering were aged at 973 K, 1023 K, 1073 K, and 1123 K (700 A degrees C, 750 A degrees C, 800 A degrees C, and 850 A degrees C), respectively. Phase composition, microstructure, and microhardness of the aged alloys were investigated in this study. Equiaxed O grains and Widmanstatten B2/beta + O laths were formed in the aged alloys, and the microhardness was improved in contrast with the spark plasma-sintered alloy without aging. The microhardness relies largely on the O-phase content, as well as the length and width of the O laths. In particular, complete Widmanstatten B2/beta + O laths, with locally finely dispersed beta precipitates, were obtained in the alloy aged at 1073 K (800 A degrees C), and the alloy exhibited the best microhardness performance. Such fine structure is due to the temperature-dependent transformations O-equiaxed -> O-primary + B2/beta (primary), O-primary -> O-secondary + B2/beta (secondary), and B2/beta (primary)-> O.
引用
收藏
页码：4365 / 4371
页数：7
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