Microstructure and Wear Properties of Cu-La2O3 Composites Prepared by Spark Plasma Sintering
Microstructure and Wear Properties of Cu-La2O3 Composites Prepared by Spark Plasma Sintering
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火花等离子烧结Cu-La2O3复合材料的显微组织和磨损性能
DOI：
10.1007/s12540-019-00489-8
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发表时间：
--
影响因子：
3.5
通讯作者：
Li Nana
中科院分区：
文献类型：
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作者：
Zheng Runguo;Li Nana
摘要 采用内氧化法制备了Cu-La2O3复合材料。根据 ASTM G99 标准，在不同的施加载荷和滑动速度下检查摩擦磨损行为。结果表明，La2O3颗粒尺寸约为150 nm，均匀分布在Cu基体中。 Cu-1.32 wt% La2O3 复合材料中铜晶粒的平均尺寸比纯铜减小了 60%。 Cu-1.32 wt% La2O3 复合材料的极限拉伸强度为 328 MPa。主要强化机制是晶粒尺寸强化和热失配强化。 Cu-1.32 wt% La2O3 复合材料的磨损率低于纯铜，并且随着施加载荷和滑动速度的增加而增加。轻度到重度磨损的转变出现在不同的载荷和速度下。磨损机制为轻度磨损中的磨粒磨损和氧化磨损。但在严重磨损时转变为塑性变形和分层磨损。图文摘要
AbstractThe Cu–La2O3composite was prepared by internal oxidation method. The friction and wear behavior was examined under different applied load and sliding velocity according to ASTM G99 standard. The results showed the size of La2O3particles was about 150 nm, which were homogeneous distributed in the Cu matrix. The mean size of Cu grains in the Cu–1.32 wt% La2O3composite decreased by 60% compared with that of pure Cu. The ultimate tensile strength of the Cu–1.32 wt% La2O3composite was 328 MPa. The dominant strengthening mechanisms were the grain size strengthening and thermal mismatch strengthening. The wear rate of Cu–1.32 wt% La2O3composites was lower than that of pure copper and it increased with the increase of applied load and sliding velocity. The mild to severe wear transition appeared at different load and velocity. The wear mechanisms were abrasive wear and oxidative wear in mild wear. However, it changed to plastic deformation and delamination wear in severe wear.Graphic abstract