Microstructure and mechanical properties of B_4C-TiB_2-Al composites fabricated by vacuum infiltration

稀有金属（英文版）, 2010, 29(1): 92-97. doi: 10.1007/s12598-010-0016-4

^1, , ^2, , ^3, , ^4,

1.Key Laboratory of the Ministry of Education for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China

2.Key Laboratory of the Ministry of Education for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China

3.Key Laboratory of the Ministry of Education for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China

4.Key Laboratory of the Ministry of Education for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China

基金项目: the Research Fund for the Doctoral Program of Higher Education(20060145028) the Program for Changjiang Scholars and Innovative Research Team in Universities of China(IRT0713) 国家自然科学基金(50372010;50902018)

Microstructure and mechanical properties of B_4C-TiB_2-Al composites fabricated by vacuum infiltration

L(U) Peng ^1, , YUE Xinyan ^2, , RU Hongqiang ^3, , YU Liang ^4,

1.Key Laboratory of the Ministry of Education for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China

2.Key Laboratory of the Ministry of Education for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China

3.Key Laboratory of the Ministry of Education for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China

4.Key Laboratory of the Ministry of Education for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China

Keywords： ceramic composite

B_4C-TiB_2-Al composites were fabricated by infiltrating aluminum into porous B_4C-TiB_2 preforms in vacuum. The microstucture and mechanical properties of the B_4C-TiB_2-Al composites were investigated. The hardness decreased, the flexurai strength increased, and the fracture toughness first increased and then decreased slightly with an increase in TiB_2 content. The B_4C-TiB_2-Al composite with 40wt.% TiB_2 showed the optimized properties. The infiltrated aluminum addition was the leading reason for the fracture toughness improvement of the composites. The tear ridges and dimples on the fracture surface of the composites increased gradually with the increase of infdtrated alu-minum content showing inter/transgranular fracture mode. The relationships between the microstructures and the mechanical properties of the composites were discussed.

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Microstructure and mechanical properties of B_4C-TiB_2-Al composites fabricated by vacuum infiltration

参考文献