田素贵,舒德龙,曾征,梁福顺,谢君

• 1:沈阳工业大学材料科学与工程学院

摘要(Abstract)：

通过对合金进行不同温度的固溶处理、蠕变曲线测定及组织形貌观察,研究了热处理工艺对4.5%Re镍基单晶合金中温蠕变行为的影响。结果表明:提高合金的固溶温度,可降低合金中元素的偏析程度,提高合金的蠕变性能。完全热处理后单晶镍基合金的组织结构由立方γ'相以共格方式嵌镶在γ基体所组成,在760℃/800 MPa条件下的蠕变期间,合金中γ'相不形成筏状组织,但在近断口区域,立方γ'相的扭曲程度增加。在施加的温度和应力条件下,合金具有良好的蠕变抗力和较长的蠕变寿命。合金在蠕变期间的变形特征是位错在基体中运动和剪切γ'相,其中,切入γ'相的<110>超位错可由{111}面交滑移到{100}面,形成K-W锁,而切过γ'相的<110>超位错在{111}面可发生分解,形成(1/3)<112>超肖可莱不全位错+层错的位错组态,阻碍位错运动和抑制位错的交滑移,是使合金具有良好蠕变抗力的主要原因。

关键词(KeyWords)： 单晶镍基合金;组织;中温蠕变;变形机制

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(50571070);; 教育部博士点基金(项目编号:20092102110003)

作者(Author): 田素贵,舒德龙,曾征,梁福顺,谢君

DOI: 10.13289/j.issn.1009-6264.2012.10.012

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