潘哲儒,张桂芳,严鹏,刘宇,张培培,冯振华,田楠

• 1:昆明理工大学冶金与能源工程学院
• 2:云南省高校复杂铁资源清洁冶金重点实验室

摘要(Abstract)：

钛铝基合金凝固组织是控制其性能的关键因素，电磁悬浮技术作为一种非接触式熔炼技术，能够显著改善合金凝固组织的形貌，从而改善其性能。采用电磁悬浮技术和不同的凝固条件对Ti-48Al-2Cr(at%)合金进行了处理，并研究了其显微组织形态结构特征。结果表明：电磁悬浮后合金的凝固组织明显区别于原始合金的凝固组织；有容器凝固的显微组织呈现放射状细密结构，出现了粗大的枝状晶体形貌，无容器凝固的显微组织呈现出典型的片层结构，显著改善了凝固组织；电磁悬浮下无容器凝固方式的Ti-48Al-2Cr合金显微组织是不同方向分布的α_2+γ片层状组织，片层组织晶粒尺寸随着He气流量上升而减小，晶粒显著细化，当电磁悬浮气氛He气流量从3.0 L/min增加至5.0 L/min时，合金的晶粒尺寸从282.5μm减小至206.6μm,晶粒尺寸细化了26.9%。

关键词(KeyWords)： Ti-48Al-2Cr合金;电磁悬浮;凝固条件;微观结构表征

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52074140)

作者(Author): 潘哲儒,张桂芳,严鹏,刘宇,张培培,冯振华,田楠

DOI: 10.13289/j.issn.1009-6264.2022-0355

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