Fabrication and fracture analysis of MoSi2 matrix composites by mechanical alloying|MA Ying(马颖), HAO Yuan(郝远), ZHANG De-liang(张德良), YU Ning(余宁)-《中国有色金属学报》官方网站|全网首发|论文开放获取

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 11 No. 6 December 2001

Fabrication and fracture analysis of
MoSi₂ matrix composites by mechanical alloying

MA Ying(马颖)¹, HAO Yuan(郝远)¹, ZHANG De-liang(张德良)², YU Ning(余宁)¹

（1. School of Materials Science & Engineering, Gansu University of Technology,
Lanzhou 730050, P.R.China;
2. Department of Materials and Process Engineering, University of Waikoto，
Hamilton 3150, New Zealand）

Abstract: Four composites, MoSi₂+ZrO₂, MoSi₂+ZrO₂(Y₂O₃), MoSi₂+ZrO₂+SiC and MoSi₂+ZrO₂(Y₂O₃)+SiC are fabricated by mechanical alloying. It is clear that cracks produced on the MoSi₂ matrix composites during hardness testing belong to the Palmquist crack system. The value of highest fracture toughness of MoSi₂+ZrO₂+SiC composite is 7.58?MPa·m^1/2, which is nearly three times that of monolithic MoSi₂. This can be attributed to well-distributed ZrO₂ and SiC particles along the boundaries of very fine MoSi₂ grains.

Key words: mechanical alloying; composites; fracture toughness; MoSi₂; ZrO₂; Y₂O₃

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW