Microstructure and mechanical properties of Ni3Al fabricated by thermal explosion and hot extrusion

被引：81
作者：
Sheng, L. Y. [1 ]
Zhang, W. [1 ]
Guo, J. T. [1 ]
Wang, Z. S. [1 ]
Ovcharenko, V. E. [2 ]
Zhou, L. Z. [1 ]
Ye, H. Q. [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
[2] Russian Acad Sci, Inst Strength Phys & Mat Sci, Siberian Branch, Tomsk, Russia
来源：
INTERMETALLICS | 2009年 / 17卷 / 07期
关键词：
Nickel aluminides; based on Ni3Al; Mechanical properties at ambient temperature; Reaction synthesis; Microstructure; COMBUSTION SYNTHESIS; NICKEL ALUMINIDES; IRON ALUMINIDES; BORON; INTERMETALLICS; SHS; DUCTILITY;
D O I：
10.1016/j.intermet.2009.01.004
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：
The dense Ni3Al with different boron and chromium addition was fabricated by the thermal explosion and hot extrusion (TE/HE) technology. Microstructure examination showed that Ni3Al contained fine grain structure (200 nm to 10 mu m). Analysis of X-ray spectra as well as transmission electron microscopy studies revealed that three phases present in all alloys: gamma-Ni, Ni3Al and dispersoids of Al2O3. With the addition of B, beta-NiAl phase and twinned Ni3Al formed, but in the B and Cr doped alloy, Cr rich phase and a spot of Cr7Ni3 particles with stacking faults inside were observed. In addition, dislocations with high density existed in all alloys. The mechanical test showed that the B and Cr addition resulted in significant improvement in mechanical properties, and TE/HE synthesized Ni3Al alloy owned more excellent mechanical properties, compared with the one synthesized by combustion. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：572 / 577
页数：6
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