| Title |
Microstructure and Wear Behavior of Hypereutectic Al - Si Alloys with Casting Processes |
| Authors |
임차용(Cha Yong Lim); 강석봉(Suk Bong Kang) |
| Abstract |
The effects of casting processes and heat treatment on the microstructure and wear behavior of hypereutectic Al-Si alloys have been investigated. Two casting processes, gas-pressurized Hot Top process(alloy A) and spray deposition casting(alloy B), with different solidification rate have been employed. The microstructure of alloy A solidified at the rate of 100℃/sec was composed of coarse faceted primary silicon and fine round eutectic silicon crystals surrounded by aluminum dendrites. There was no primary silicon in the Alloy B which was rapidly solidified. Small and evenly distributed Si crystals were obtained in the alloy B due to the rapid solidification of liquid droplets. The improved dry wear resistance of alloy B compared to that of alloy A was attributed to these fine silicon particles. High temperature formability of alloy B was also evaluated by compression tests. |