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

页码：1461 / 1471

页数：11

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