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用 OM及 TEM对 Al3Ti· Al N/ZL 10 1及 Al3Ti/ZL 10 1原位复合材料的微观结构进行了研究 ,并测试了试验材料的力学性能。通过综合分析微观结构对力学性能的影响 ,探讨了原位复合材料的增强机制。研究结果表明 :原位复合材料中由于 0 .5μm左右增强相的存在 ,使基体及共晶硅的晶粒明显细化 ;增强相均匀弥散地分布于α- Al晶粒内部 ,对α- Al有强烈的细化作用 ;复合增强体强化的原位复合材料 Al3Ti· Al N/ZL 10 1比单一增强体强化的原位复合材料Al3Ti/ZL 10 1及基体材料 ZL 10 1有更好的力学性能。细晶强化和弥散强化是本文所述的原位复合材料的主要强化机制
The microstructure of Al3Ti · Al N / ZL 10 1 and Al3Ti / ZL 10 1 in-situ composites were studied by OM and TEM, and the mechanical properties of the tested materials were tested. By comprehensive analysis of the microstructure on the mechanical properties, the reinforcement mechanism of in-situ composites was discussed. The results show that in the in-situ composites, the grains of the matrix and the eutectic silicon are obviously refined because of the presence of the reinforcing phase of about 0.5μm. The reinforcing phase is uniformly distributed in the α-Al grains, Which has a stronger refinement effect. Al3Ti · Al N / ZL 10 1 reinforced by composite reinforcements has better mechanics than Al3Ti / ZL 10 1 and ZL 10 1 reinforced with single reinforcements performance. Fine grain strengthening and dispersion strengthening are the main strengthening mechanisms of in-situ composites described in this paper