使用冷壁坩埚真空感应炉熔炼及金属模铸造方法,制备了Ti-8.15Si合金.利用光学显微镜、XRD、SEM、多功能试验机等技术,研究了合金的凝固组织特点、热处理对组织形貌的影响及抗压性能.结果表明,Ti-8.15Si合金可以获得aTi和Ti5Si3化合物形成的共晶组织,初生Ti5Si3相为比较粗大的棒状,共晶Ti5Si3相为细小的枝状或棒状,横断面呈六角形结构.1323 K保温60 min热处理使粗大棒状的Ti5Si3相显著减小；枝状Ti5Si3相变成非连续的、细小的粒状形态,改进了抗压综合性能.保温120 min Ti5Si3相逐渐长大,并且有少量块状的Ti3Si相生成,保温时间延长到180 min,Ti3Si相数量明显增多,材料的硬度和抗压强度增加,塑性降低.
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