STUDY ON MECHANICAL PROPERTIES OF A356 （研究力学性能A356）.pdfVIP

Journal of Marine Science and Technology, Vol. 16, No. 4, pp. 271-274 (2008) 271 STUDY ON MECHANICAL PROPERTIES OF A356 ALLOYS ENHANCED WITH PREFORMED THIXOTROPIC STRUCTURE Shueiwan H. Juang* and Shyh-Ming Wu** slurry with near spherical primary crystals suspending in the Key words: A356 alloy, thixotropic structure, mechanical properties. liquid metal matrix would form in a partially-solidified metallic alloy if continuous shearing was applied [5]. The material can have a good fluidity when the solid fraction is as high as 60%. ABSTRACT Thus the metallic alloy can be formed into a shape at par- A preformed A356 alloys with thixotropic structure (desig- tially-solidified state. nated M-A356) was systematically studied on mechanical When a heat-treatable A356 aluminum alloy undergoes pre- properties in order to establish the database for further inves- cipitation hardening (age-hardening), fine precipitants will tigations in forming and heat treatment. Because of the specific dissolve completely in saturated matrix to achieve high strength microstructure and characteristics, the heat treatment conditions in material [2]. The processing temperature should be kept close of M-A356 were explored through the observations of mi- to the eutectic temperature of the alloy in order to obtain crostructure