Abstract
采用激光区熔快速定向凝固技术制备出Al 2 O 3 /Er 3 Al 5 O 12 (EAG)共晶自生复合陶瓷, 研究了不同激光扫描速率下材料的凝固组织特征及其演变规律, 并对其力学性能和增韧机制进行了分析. 结果表明: 激光区熔Al 2 O 3 /EAG由连续的Al 2 O 3 和EAG两相组成, 两相相互交错分布, 形成均匀的三维网状结构; 共晶间距细小, 在0.2~2.1μm之间, 并随着扫描速率的增加规律性地减小. 在低的扫描速率下, 微观组织呈现典型的层片状非规则共晶组织; 当扫描速率增至800μm/s时, 出现了胞状及EAG树枝晶. 共晶陶瓷的硬度和断裂韧性分别为18.7GPa和2.45MPa·m 1/2 . 微观组织高度细化以及裂纹扩展过程中沿两相界面偏转、分叉等机制提高了材料的韧性.
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