[111]取向镍基单晶合金的组织结构与蠕变行为

中国有色金属学报, 2012, 22(6): 1624-1631.

[111]取向镍基单晶合金的组织结构与蠕变行为

苏勇 ^1, , 田素贵 ^2, , 于莉丽 ^3, , 于慧臣 ^4, , 张姝 ^5, , 钱本江 ^6,

1.沈阳工业大学材料科学与工程学院,沈阳110870;沈阳化工大学机械工程学院,沈阳110142

2.沈阳工业大学材料科学与工程学院,沈阳110870

3.沈阳工业大学材料科学与工程学院,沈阳110870

4.北京航空材料研究院,北京100095

5.沈阳工业大学材料科学与工程学院,沈阳110870

6.沈阳工业大学材料科学与工程学院,沈阳110870

基金项目: 国家自然科学基金资助项目(50571070)

关键词：单晶镍基合金 , [111]取向 , 蠕变 , 组织演化 , 亚晶 , 变形特征

Microstructure and creep behavior of [111] orientation single crystal nickel-based superalloy

通过蠕变曲线的测定及微观组织形貌观察,研究[111]取向镍基单晶合金在高温低应力条件下的组织结构与蠕变行为.结果表明:经完全热处理后,[111]取向单晶合金的组织结构是立方y′相以共格方式嵌镶在y基体中,并沿<100>方向规则排列；在1 040-1 080℃、137～180 MPa的温度和应力范围内,该取向单晶合金表现出明显的温度和施加应力敏感性.蠕变期间,y′相沿与应力轴呈一定角度形成筏状组织,蠕变后期在近断口区域筏状y′相发生粗化和扭折.[111]取向单晶合金在蠕变期间的变形特征是位错在y基体通道中运动和剪切筏状y′相,由于形变量较大,较多位错切入筏状y′相后使其形成亚晶结构,其中,蠕变后期大量位错切入筏状y′相导致合金的蠕变抗力降低,是合金发生蠕变断裂的主要原因.

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