メカニカルアロイング粉末を用いたマグネシウム合金の表面改質 : 耐摩耗性と耐食性

概要

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Mechanically alloyed (MA) powder with Mg-30, 40 and 61.5 mol%Al compositions (30AlMA, 40AlMA and 61.5AlMA) were compressively bonded to a surface of magnesium alloy (AZ31B) rod, and then wear and corrosion properties of the bonded MA alloy layer were investigated. The wear resistance was examined by sliding of hardened steel on the surface of the bonded MA alloy layer using disk-on-ring type wear tester and the corrosion resistance of that was estimated by salt-water spray test. Wear loss of the bonded MA alloy layer surface by the sliding of hardened steel is remarkably smaller than that of AZ31 alloy. This shows the wear resistance of magnesium alloy can be improved by the compressive bonding of MA powder with high aluminum content because of high hardness of the MA alloy layer. Corrosion has not practically progressed on surfaces of the 40AlMA and 61.5AlMA alloy layers when they were salt-water sprayed for over 28.8ks, whereas the surfaces of AZ31 alloy and 30AlMA alloy layer were remarkably corroded.
社団法人粉体粉末冶金協会の論文
2006-01-15