Paper number 623
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EFFECT OF MATRIX AND REINFORCEMENT MORPHOLOGY ON MECHANICAL PROPERTIES OF AL/TINI SHAPE MEMORY COMPOSITE |
Changhun Han1, Ildong Choi2, Kyungmox Cho1 and Ikmin Park1
1Department of Metallurgy Engineering, Pusan National University, Pusan, 609-735, Korea
2Department of Materials Engineering, Korea Maritime University, Pusan, 609-731, Korea
| Summary | Metal matrix composites reinforced with shape memory alloys induce compressive residual stress in the matrices resulting in improved tensile properties of the composite. In the present study, Al/TiNi shape memory composites were fabricated by squeeze casting and powder metallurgy method so called Plasma Activated Sintering(PAS). Fairly good matrix/reinforcement bonding was observed in the Al/TiNi composites. The effects of residual stress caused by the shape recovery force have been compared as a function of reinforcement volume fraction, prestrain, matrix strength and reinforcement shape. Strengthening effect due to TiNi reinforcement as well as compressive residual stress was investigated. It was found that the yield strength of the composites increased with increasing the volume fraction of TiNi reinforcement and the amount of prestrain applied to the composite. Moreover, the percentage of strength increment of pure continuous fiber Al/TiNi(Al/TiNicf) composite caused by prestrain was higher than that of AC4A Al/TiNicf composite. |
Keywords | squeeze casting, plasma activated sintering, interfacial bonding, compressive residual stress, shape memory effect, Al/TiNi composite. |