Analysis of interfacial shear strength of SiC fiber reinforced 7075 aluminum composite by pushout microindentation |
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Authors: | Liang-Guang Chen Su-Jien Lin Shou-Yi Chang |
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Affiliation: | (1) the Department of Materials Science and Engineering, National Tsing Hua University, 300 Hsinchu, Taiwan R.O.C.;(2) the Department of Materials Engineering, National Chung Hsing University, 402 Taichung, Taiwan R.O.C. |
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Abstract: | The interfacial shear strength of continuous silicon carbide fiber reinforced 7075 aluminum matrix composite (SiCf/7075Al) has been investigated in this research by pushout microindentation. The SiCf/7075Al composite specimens were processed by diffusion bonding alternate layers of SiC fibers and 7075Al alloy plates. From
the measured stress-displacement curves of indentation tests, the interfacial shear strengths of the composite specimens were
obtained, and the stress-displacement curves were basically divided into two regions: (1) elastic deformation and (2) interface
decohesion and fiber sliding. With increasing aging time, the interfacial shear strength of the composite increased to 167
MPa for T6-treated specimens, and the variation of the interfacial shear strength well followed that of the ultimate tensile
strength of 7075Al matrix alloy. With decreasing specimen thickness, the interfacial shear strength of the composite and the
amplitude of stress fluctuation slightly decreased because of the stress relaxation effect near specimen surfaces. Under higher
indentation velocities, both the interfacial shear strength and the amplitude of stress fluctuation became smaller. |
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