Effect of heating rate on porous TiAl-based intermetallics synthesized by thermal explosion

被引：18

作者：

Jiao, Xinyang ^{[1
]}

Wang, Xiaohong ^{[1
]}

Kang, Xueqin ^{[1
]}

Feng, Peizhong ^{[1
]}

Zhang, Laiqi ^{[2
]}

Akhtar, Farid ^{[3
]}

机构：

[1] China Univ Min & Technol, Sch Mat Sci & Engn, Room 405, Xuzhou 221116, Peoples R China

[2] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing, Peoples R China

[3] Lulea Univ Technol, Div Mat Sci, Lulea, Sweden

来源：

MATERIALS AND MANUFACTURING PROCESSES | 2017年 / 32卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Heating; intermetallics; microstructure; structures; synthesis; transformation; vacuum; HIGH-TEMPERATURE; AL; MICROSTRUCTURE; FABRICATION; MECHANISM; STEEL; SHS;

D O I：

10.1080/10426914.2016.1232826

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

TiAl-based porous materials were synthesized by a novel process of thermal explosion (TE) reaction. The effects of heating rate on the expansion behavior of powder assemblies, phase compositions, and pore structures were investigated. Results showed that the actual temperature of specimen increased rapidly from 655 to 661 degrees C (furnace temperature) to 1018-1136 degrees C (combustion temperature) in a short time interval of 25-55s, indicating that an obvious TE reaction occurred at different heating rates (1, 2, 5, and 10 degrees C min(-1)). TE reaction in Ti/Al powder assemblies resulted in the formation of open-celled TiAl-based intermetallics. When the heating rate was set at 5 degrees C min(-1), the maximum open porosity of 59% was obtained in Ti-Al bodies, which experienced the highest combustion temperature (1136 degrees C) and underwent maximum volume expansion (48%). The pore size distribution was uniform and pores were interconnected in TE products.

引用

页码：489 / 494

页数：6

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