Influence of elevated Fe, Ni and Cr levels on tensile properties of SSM-HPDC Al-Si-Mg alloy F357
The microstructures and tensile properties of semisolid metal high pressure die cast (SSM-HPDC) F357 alloys with low and high levels of Fe, Ni and Cr were,compared in different temper conditions. ThermoCale software was used to predict the different intermetallies that can be expected in the alloys, and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) was used to investigate the actual intermetallies that formed. The influence of these intermetaUics on tensile properties was quantified. The results show that lower strength is obtained in the alloy with high Fe, Ni and Cr levels. This is attributed mainly to the formation of more πAl8FeMg3Si6 phase, which removes strengthening Mg atoms from solid solution. Also, the ductility of the high Fe, Ni and Cr levels alloy is decreased significantly due to microcracking of the higher volume fraction π-AlsFeMg3Si6 and Al9FeNi phases. The combination of lower strength and ductility results in a decrease of the quality index of this alloy compared with the alloy with low levels of Fe, Ni and Cr.
semi-solid metal (SSM) forming alloy F357 heat treatment intermetallics π-Al8FeMg3Si6 A19FeNi β-Al5FeSi
H.M(o)LLER W. E. STUMPF P. C. PISTORIUS
Materials Science and Manufacturing, Council for Scientific and Industrial Research (CSIR), Pretoria Department of Materials Science and Metallurgical Engineering, University of Pretoria,Pretoria,South Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh,United State
国际会议
北京
英文
842-846
2010-09-16（万方平台首次上网日期，不代表论文的发表时间）