Processing, microstructure and properties of C40Mo(Si,AI)2/Al2O3 composites

被引：10

作者：

Krakhmalev, PV

Ström, E

Sundberg, M

Li, C

机构：

[1] Chalmers, Dept Mat Sci & Met, S-41296 Gothenburg, Sweden

[2] KANTHAL AB, S-73427 Hallstahammar, Sweden

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2003年 / 360卷 / 1-2期

关键词：

mechanical alloying; spark plasma sintering; Mo(Si0.75Al0.25)(2)/Al2O3 intermetallic compound; microstructure; hardness; indentation toughness;

D O I：

10.1016/S0921-5093(03)00430-1

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The C40 Mo(Si0.75Al0.25)(2)/Al2O3 Composites Were prepared by spark plasma sintering (SPS) of mechanically alloyed (MA) powders. The Mo(Si0.75Al0.25)(2)/0-20 vol.% Al2O3 materials, showing micron and submicron composite structure, possess a hardness of 13.9-14.6 GPa but a poor toughness of 1.78-1.80 MPa m(1/2). The addition of 30 vol.% Al2O3 leads to the formation of the micron C40 Mo(Si0.75Al0.25)(2)/Al2O3 composite with an intergranular distribution of Al2O3, that results in a drop of the hardness to 10.2 GPa and an improvement of the toughness to 3.67 MPa m(1/2). The transition of the cleavage facets to the intergranular fracture with the addition of Al2O3 is assumed as the main toughening mechanism. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：207 / 213

页数：7

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