原位合成TiCp/Al预制块及其在镁液中的熔化行为

来源期刊:中国有色金属学报2004年第11期

论文作者:陈晓 傅高升 钱匡武 陈鸿玲

文章页码:1875 - 1880

关键词:镁基复合材料; TiCp/Al预制块; 熔化行为; 原位合成

Key words:Mg matrix composite; TiCp/Al prefabricating alloy; melting behavior; in-situ synthesis

摘    要:采用XD法原位合成TiCp/Al预制块, 并通过XRD、 SEM、 EDAX和DTA等手段研究了预制块的组织和性能, 探讨了TiCp/Al预制块在镁液中的熔化行为。 结果表明: TiCp/Al预制块中, 基体Al的熔点约为635.7 ℃, 略低于纯铝的熔点, 但TiC粒子之间存在较强的结合力, 使其在高温加热时仍能保持原有形状; 未搅拌时, TiCp/Al预制块在800 ℃的镁液中保温60 min后仍不熔化, 采用搅拌工艺有利于促进TiCp/Al预制块的熔化, 并且使TiC粒子在熔体中均匀分布。 TiCp/Al预制块在镁液中熔化时, 基体Al通过熔化和对流扩散进入到镁液中, TiC粒子间的较强的结合力需通过搅拌产生的剪切力才能破坏, 并随镁液流动进入到镁液中。 机械搅拌可使TiC粒子在镁液中均匀分布。

Abstract: TiCp/Al prefabricating alloy was fabricated by in situ reaction, and its microstructure and mechanical properties were investigated by means of XRD, SEM, EDAX, DTA etc. It is found that the melting point of Al matrix in TiCp/Al prefabricating alloy is about 635 ℃, which is lower than that of pure Al, but there exists a kind of stronger combinational force between TiC particles, which makes the TiCp/Al prefabricating alloy keep its shape at high temperature of 800 ℃. The TiCp/Al prefabricating alloy is melted in molten Mg with different technologies. The results show that the TiCp/Al prefabricating alloy will not be melted after holding for 60 min at 800 ℃ without mechanical stirring; on the other hand, by means of mechanical stirring it can be melted in molten Mg, and therefore makes TiC distribute uniformly in molten Mg. The melting mechanism of the TiCp/Al prefabricating alloy in molten Mg can be explained as follows: with the help of shear force of molten alloy flow produced by mechanical stirring, the combinational force between TiC particles will be destroyed, and therefore, the particles can easily distribute uniformly into the molten Mg.

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