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A Study on the Characteristics of Microstructures in the Semi-solid State of Aluminum Powder Alloys  

Lee, Sang-Yong (School of Advanced Materials Engineering, Andong National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.21, no.4, 2008 , pp. 205-212 More about this Journal
Abstract
Characteristics of microstructures, mechanical properties and formability of two Al-20Si-5Fe-2Ni alloys produced by gas atomizing (P/M) and spray forming (S/F) respectively were compared at temperatures up to $560^{\circ}C$. Room temperature hardness values and tensile strengths of both alloys were increased in accordance with temperature after heat treatment above $300^{\circ}C$. The highest values of hardness and tensile strength of both alloys were obtained at $490^{\circ}C$. It was interpreted that increase in hardness and tensile strength according to heating temperature between $300{\sim}490^{\circ}C$ was mainly related to increase in internal stress between Al matrix and reprecipitated particles. S/F alloys showed better formability and wear property than P/M alloys due to the homogenity of microstructures above $300^{\circ}C$.
Keywords
hypereutectic Al-Si alloys; powder metallurgy; spray forming; homogenity of microstructure; mechanical property; formability; wear property;
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