复合铸造工艺参数对A356-SiCp复合材料显微组织和拉伸性能的影响.pdf

Trans. Nonferrous Met. Soc. China 24(2014) 2482−2488


Effects pocasting process parameters on microstructural
characteristics and tensile properties of A356−posites

Hamed KHOSRAVI, Hamed BAKHSHI, Erfan SALAHINEJAD

Faculty of Materials Science and Engineering, . Toosi University of Technology, Tehran, Iran

Received 22 October 2013; accepted 21 March 2014


Abstract: The effects pocasting process parameters on some structural and tensile characteristics of the A356−10% SiCp
(volume fraction) composites were studied. Semisolid stirring was carried out at temperatures of 590, 600 and 610 °C with stirring
speeds of 200, 400 and 600 r/min for 10, 20 and 30 min. The distribution of the SiC particles within the matrix, porosity content and
tensile properties of the obtained samples were examined. The structural evaluations show that by increasing the stirring time and
decreasing the stirring temperature, the uniformity in the particle distribution is improved; however, by increasing the stirring speed
the homogeneity firstly increases and then declines. It is also found that by increasing all of the processing parameters, the porosity
content is enhanced. From the tensile characteristics viewpoint, the optimum values of the speed, temperature and time are found to
be 400 r/min, 590 °C and 30 min, respectively. The contribution of the