通过对镍基合金GH80A进行大变形异步与同步轧制,制备了纳米组织材料,研究了退火处理对纳米组织GH80A材料的组织与力学性能的影响.结果表明,大变形轧制后的材料的晶粒细化至约50 nm,其抗拉强度从646 MPa提升至1787 MPa,在700℃下进行退火处理后,抗拉强度可以达到2111MPa;退火温度对取向影响不大.所制备的超细晶材料具有良好的组织热稳定性,在700℃下退火,晶粒尺寸约150 nm,在800℃下退火1h,晶粒尺寸仍然能够保持在250 nm以下.分析认为,超细晶镍基GH80A材料的组织稳定性与强度的显著提高与γ'相的析出有直接关系.
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