Microstructure and mechanical behaviour of reaction hot pressed multiphase Mo-Si-B and Mo-Si-B-Al intermetallic alloys

被引：51
|
作者：
Mitra, R. [1 ]
Srivastava, A. K.
Prasad, N. Eswara
Kumari, Sweety
机构：
[1] Indian Inst Technol, Dept Met & Mat Engn, Kharagpur 721302, W Bengal, India
[2] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
来源：
INTERMETALLICS | 2006年 / 14卷 / 12期
关键词：
molybdenum silicides; multiphase intermetallics; fracture toughness; mechanical properties at high temperature; reaction synthesis;
D O I：
10.1016/j.intermet.2006.01.057
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：
Microstructures of 76Mo-14Si-10B, 77Mo-12Si-8B-3Al, and 73.4Mo-11.2Si-8.1B-7.3Al alloys, processed by reaction hot pressing of elemental powder mixtures, have shown alpha-Mo, Mo3Si, and Mo5SiB2 phases. In addition, particles of SiO2 formed from the oxygen content of raw materials could be seen in the 76Mo-14Si-10B alloy, while alpha-Al2O3 formed in the alloys containing Al. Parts of the Al have been found within the solid solutions of alpha-Mo and Mo3Si. The average fracture toughness determined from indentation crack lengths and. three-point bend testing of single edge notch bend specimens lies in the range of 5.0-8.7 MPa root m, with alloys containing Al demonstrating higher values. Analyses of load-displacement plots, fracture profiles and indentation crack paths have shown evidence of R-curve type behaviour and operating toughening mechanisms involving crack bridging by alpha-Mo, crack deflection and branching. Flexural strength is related to volume fraction of the alpha-Mo and Al content. Compression tests on the 76Mo-14Si-10B alloy between 1100 degrees C and 1350 degrees C have shown excellent strength retention, and evidence of thermally activated plastic flow. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1461 / 1471
页数：11
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