蔡艳芝 Likes:

Affiliation of Author(s):

材料科学与工程学院

Journal:

Materials Science & Engineering A

Key Words:

中文关键字：力学性能；Ti3SiC2/TiC–Al2O3 复合材料；原位反应；显微结构，英文关键字：Mechanical properties; Ti3SiC2/TiC–Al2O3 composite

Abstract:

Ti3SiC2/TiC–Al2O3 composites with different Al2O3 contents were fabricated by in-situ reaction and hot pressing sintering. Laminar Ti3SiC2 grains and granular Al2O3 grains were densely packed and tightly bonded, and cubic TiC grains presented in the surfaces of Ti3SiC2 grains. Al2O3 significantly restrained the grain growth of Ti3SiC2 matrix. The dispersed Al2O3 grains inclined to be pulled out, but Al2O3 aggregates inclined to be cut by the crack front at the crack surface. The flexural strength and fracture toughness first increased and then decreased with the increasing Al2O3 content. The composite with 20 wt% Al2O3 addition showed the highest flexural strength of 649 MPa and with 10 wt% Al2O3 addition showed the best fracture toughness of 7.15 MPa m1/2. The mechanism responsible for improved mechanical properties for Ti3SiC2/TiC–Al2O3 composites were the synergistic action of particulate dispersion reinforcement, fine-grain toughening, grain pullout, microcrack deflection, and lamella bending and slipping from three different kinds of grains.

Note:

该论文的SCI检索号：000317994700018

Co-author:

潘丽青,陈盼军,孙高磊

First Author:

yinhongfeng,caiyanzhi

Indexed by:

Journal paper

Volume:

卷：571

Issue:

期：

Page Number:

页：137–143

Translation or Not:

no

Date of Publication:

2013-06-01