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利用TEM和XRD原位研究了一种镍基单晶高温合金在时效过程中的取向变化。研究发现固溶-时效热处理后的初始样品内部不同γ’相之间存在~4°的小角度晶界。对材料在950℃下进行10 min短时时效处理,原位TEM和XRD结果表明γ’相的取向偏离初始取向~5°,且该取向变化在降温之后也不会完全恢复;该短时升、降温过程使γ’相的取向集中度增加。
In situ TEM and XRD study of a nickel-based single crystal superalloy during aging changes in orientation. The results show that there is a ~ 4 ° small-angle grain boundary between different γ ’phases in the initial sample after solution heat-treatment. The material was subjected to short-time aging treatment at 950 ℃ for 10 min. The in-situ TEM and XRD results showed that the orientation of γ ’phase deviated from the initial orientation ~ 5 ° and the orientation change did not recover completely after cooling down. , The cooling process makes the concentration of γ ’phase orientation increased.