A Study of Employing Spark Plasma Sintering to Consolidate 6061 Al Powder Synthesized by Rapid-Solidifying Atomization into Bulk 6061 Al Alloy and its Mechanical Properties

• Main Authors: Yi-ChuanChen, 陳繹全
• Other Authors: Chi-Yuan A. Tsao
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/73089548256870276519

碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 101 === Spark Plasma Sintering (SPS) is one of the promising PM techniques in recent years, with which sintering process can be accomplished in a relatively short time. In this study, SPS was used to consolidate the AA6061 Al alloy powders synthesized by Rapid-solid Atomization (RSA) with grain sizes of less than 2μm, in which nine sets of parameters, temperature and time, were designed to study the effects of the parameters on the microstructure and mechanical properties. The micro-hardness and compressive properties of the nine SPSed specimens and conventional cast 6061 alloy were tested and compared. The highest compressive strength and hardness were obtained with the specimen SPSed at 400oC for 10 minutes. The compressive strength and hardness of SPSed 6061 are 1.6 times and 1.5 times higher than those of the conventional cast 6061, respectively. The SPSed 6061 with the highest compressive strength and conventional cast 6061were then extruded with backward extrusion method to study the workability of the SPSed 6061, and Workability Limit Diagram was plotted accordingly, which shows that the SPSed 6061 has better workability than conventional cast 6061. The extruded SPSed 6061 and conventional cast 6061 were then tensile-tested, and the SPSed 6061 has higher UTS and ductility than as-cast ones.