High temperature wear behaviour of Al-4Cu-TiB 2 in situ composites
High temperature wear behaviour of Al-4Cu-TiB 2 in situ composites
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发表时间：
2010-05
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通讯作者：
S. Kumar;V. Sarma;B. S. Murty
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作者：
S. Kumar;V. Sarma;B. S. Murty
研究了滑动温度和载荷对Al-4Cu合金和Al-4Cu- tib2原位复合材料磨损性能的影响。在所有温度和载荷下，Al-4Cu合金的耐磨性都随着tib2增强颗粒wt %的增加而提高。tib2颗粒的加入对由轻度磨损到重度磨损的转变有强烈的影响。在80 N载荷和100℃滑动温度下，Al-4Cu合金表现出从轻度到重度磨损的转变。在Al-4Cu基体中加入5%和10%的原位tib2颗粒，相变温度分别提高到200℃和300℃，载荷分别提高到100和120 N。对磨损表面的扫描电镜分析揭示了磨损模式的转变。在高温下，Al-4Cu合金的主要磨损机制是粘附和金属流动，而Al-4Cu- tib2复合材料的主要磨损机制是氧化、脱层和金属流动。
The effect of sliding temperature and load on the wear behavior of Al-4Cu alloy and Al-4Cu-TiB 2 in situ composites was studied in this paper. The wear resistance of the Al-4Cu alloy increased with increase in wt.% of reinforcement TiB 2 particles at all temperatures and loads. The transition in the wear mode from mild to severe wear was strongly influenced by the addition of TiB 2 particles. The Al-4Cu alloy showed a transition from mild to severe wear at a load of 80 N and at a sliding temperature of 100 °C. But with the addition of 5 and 10 wt.% of in situ TiB 2 particles to the Al-4Cu matrix, the transition temperatures are increased to 200 and 300 °C and the loads are increased to 100 and 120 N, respectively. Analysis of wear surfaces by scanning electron microscopy revealed the transition in wear mode. It was observed that at elevated temperature the predominant wear mechanisms for the Al-4Cu alloys are adhesion and metal flow, whereas for Al-4Cu-TiB 2 composites oxidation, delamination and metal flow are the most dominant wear mechanisms.