材料成型与控制工程专业毕业设计英文文献--变质处理对铝硅合金组织和热性能的影响.doc

学 号14092000033 毕业设计 题目： 作 者 秦亚红 届 别 　 2013 届 院 别 机械工程学院 专 业 材料成型及控制工程 指导教师 职 称 教 授 完成时间 2012年5月12日 Effect of Fe and Mn additions on microstructure and wear properties of spray-deposited Al–20Si alloy Feng Wang*, Zhengye Zhang, Yajun Ma, Yuansheng Jin Received 8 September 2003; received in revised form 23 February 2004; accepted 27 February 2004 Available online 20 April 2004 Abstract In this study, the hypereutectic Al–Si alloys were synthesized by spray atomization and deposition technique. The microstructures of spray-deposited alloys were studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The dry sliding wear behavior of the alloys was investigated under the applied load of 8.9–35.6 N. The wear behavior of the alloys was dependent on the morphology of the intermetallics in microstructure and applied load. At lower load (8.9 and 17.8N), the Fe-containing alloy showed higher wear rate compared with the binary alloy due to the tendency for embrittlement brought about by needle-like intermetallics. At higher load (35.6 N), Fe- and Mn containing alloy exhibited inferior wear resistance than the binary alloy due to the fragmentation of the intermetallics, thus leading to easier crack nucleation and propagation. D 2004 Elsevier B.V. All rights reserved. Keywords: Microstructure; Dry sliding wear behavior; Spray deposition; Wear mechanism 1. Introduction Al–Si-based alloys have been investigated for automotive applications because of attractive combinations of low coefficient of thermal expansion (CTE), high modulus,excellent wear resistance and good thermal stability [1,2].High Si content in Al–Si alloys usually leads to the formation of coarse Si phase under slow solid