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Evaluate the Effects of Various Surface Roughness on the Tribological Characteristics under Dry and Lubricated Conditions for Al-Si Alloy

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Journal of Surface Engineered Materials and Advanced Technology 2012年第3期2卷 167-173页

作者： Riyadh A. Al-Samarai Haftirman khairel rafezi ahmad Y. Al-Douri Institute of Nano Electronic Engineering University Malaysia Perlis Kangar Malaysia. School of Materials Engineering University Malaysia Perlis Arau Malaysia School of Mechatronic Engineering University Malaysia Perlis Ulu Pau Malaysia

The effect of surface roughness average of hypereutectic aluminum silicon alloys (with 16 wt% Si) on the friction and wear was investigated. Various surface roughness average (Ra) of different degrees was verified as well as three different loads 10, 20 and 30 N, speeds 200, 300 and 400 rpm and relative humidity 77%. Different surface preparation techniques are resulted in different Ra values from (6, 8 and 12) ± 0.05 μm. The contacts were dried sliding and lubricated regime at 2.5 centimeters per second. Surfaces were analyzed with scanning electron microscopy and X-ray dispersive analyses. It was noted that the weighted and volumetric wear rate decreases as degree of roughness decreases, as well as coefficient of friction is considered as a function of the stability state. Wear rate is decreased and the transition stress from high to low wear is increased with increasing surface roughness average. There was a correlation between friction coefficient and hardness.

关键词： Aluminum-Silicon Alloy Boundary Lubrication Casting Surface Roughness Adhesive Wear

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Sintering Behavior and Microstructure Evolution of Mechanically Alloyed W-Bronze Composite Powders by Two-step Ball Milling Process

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Journal of Materials Science & Technology 2013年第1期29卷 59-69页

作者： Kahtan S. Mohammed Azmi Rahmat khairel R. ahmad School of Materials Engineering Universiti Malaysia Perlis

The miscibility of W in Sn and Cu is extremely poor. Sintering of W-bronze composites to their full density is proved to be difficult. To tackle this problem, the ball milling process of the W-bronze powder mixture proposed in this study was split into two steps. In the first step, the softness of Sn powder was exploited to modify the surface morphology of W particles. In the second step, Cu was added to the ball milled mixture. To achieve this goal, four 50 wt% W-bronze compact sets of different powder precursors and activator additions were produced. The sintering process was performed at 1150 ℃. The two-step ball milled powder yielded sintered compacts of homogeneous microstructure of fine polygonal W grains dispersed in bronze matrix. They showed the highest hardness and densification levels. The sintered density, microstructure, hardness and densification mechanisms of the sintered compacts were investigated, examined and evaluated using different metallographic, microscopic and measurement facilities.

关键词： Metal matrix composites Mechanical alloying Sintering Microstructure Scanning electron microscopy

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