孙涛,王清,耿明,孙东立,武高辉

• 1:哈尔滨工业大学材料科学与工程学院

摘要(Abstract)：

利用金相显微镜、扫描和透射电镜等仪器表征了TiAl合金的片层组织及结构特征,研究了Ti-48Al at%合金片层组织的形成机制和片层组织细化工艺及其机理。结果表明,Ti-48Al合金单级热处理能够得到全片层组织,平均晶粒尺寸约150μm,片层间距约1.30μm。其形成过程是:γ相在α相晶内(0001)面上通过全位错分解成核,通过不全位错滑移、层错区扩展而长大。循环热处理和双温热处理均能将片层晶粒尺寸细化到30μm,片层间距0.90μm,前者的细化机理为相变重结晶细化了α相晶粒,后者细化片层组织的关键在于低温段(α2+γ)两相区热处理形成细小的双态组织。

关键词(KeyWords)： TiAl合金;片层结构;组织细化;热处理

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 孙涛,王清,耿明,孙东立,武高辉

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