ABSTRACT

The aim of this study is to improve the tribological behaviour of aluminium alloys by using grain refiner and modifier. The effects of Al5Ti1B grain refiner and Al10Sr modifier additives on friction and wear properties on A380, A357 alloys produced by pouring sand andpermanent mould casting were investigated. Abrasion tests were carried out under dry conditions against St1040 steel disc using a pin-disk system with 20 N load and 1.0 m/s sliding speed. It was determined that grain refiner and modifier additives decrease the friction coefficient and increase the wear resistance. It was determined that the samples produced by permanent mould casting method decreased the friction resistance by 9% and the abrasion resistance increased by 40% compared to the samples produced in sand mould. The lowest wear rate was obtained in A380 alloy with TiB and Sr added with a value of 4.87 × 10^–11 m²/N.

摘要

本研究的目的是通过使用晶粒细化剂和改性剂来改善铝合金的摩擦学行为。研究了Al5Ti1B晶粒细化剂和Al10Sr改性添加剂对A380、A357浇砂和永模铸造合金摩擦磨损性能的影响。磨损测试是在干燥条件下对 St1040 钢盘使用销盘系统进行的，载荷为 20 N，滑动速度为 1.0 m/s。已确定晶粒细化剂和改性剂添加剂降低了摩擦系数并增加了耐磨性。经测定，与砂模法生产的样品相比，采用永久型铸造法生产的样品摩擦阻力降低了 9%，耐磨性提高了 40%。^–11米² /N。