为了解元素钨含量对新型钴-铝-钨合金中γ'强化相的影响,用燃烧合成法制备了不同钨含量的合金,通过SEM、XRD、EPMA、DSC等方法分析了钨含量对合金中γ'强化相形貌、数量以及稳定性的影响.结果表明:钴-铝-钨合金显微组织是由富钴基体及其γ'-Co_3(Al,W)强化相和少量碳化物组成;γ'-Co_3(Al,W)强化相比Co_3Al具有更好的稳定性,随着钨含量的增加,合金的液相线温度升高,强化相的数量也增加;当钨质量分数为26.36%时合金中γ强化相的稳定性最好.
In order to study the influence of tungsten dement content on γ'strengthening phase in Co-Al-W alloy,the alloys with different tungsten contents were prepared by combustion synthesis.The effect of tungsten content on the morphology,amount and stablization of γ'strengthening phase was studied by using SEM,XRD,EPMA and DSC.The results show that the microstructure of Co-Al-W alloy consisted of rich γ'Co matrix,γ'-Co_3(Al,W) strengthening phase and less carbides.γ'-Co_3(Al,W) strengthening phase was more stable than Co_3 Al phase.The liquidus temperature of the alloy increased and the amount of the strengthening phase increased as the W content inceased.The best stabilization effect of the element on the phase could obtain as the W content was 26.36wt%.
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