Neutron Diffraction Measurements of a Thermally Fatigued Single Crystal Superalloy
Neutron Diffraction Measurements of a Thermally Fatigued Single Crystal Superalloy作者机构：Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 Institute of Nuclear Physics and Chemistry Mianyang 621900 National Laboratory for Materials Science IMR CAS Shenyang 110016 Institute of Laue Langevin Grenoble 38042 France
出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)
年 卷 期：2009年第26卷第8期
页 面：240-243页
核心收录：
学科分类：070207[理学-光学] 07[理学] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0803[工学-光学工程] 0702[理学-物理学]
主 题：sea surface nonliear interaction numerical method
摘 要：The thermally fatigued single crystal superalloy DZ125L is investigated by neutron diffraction measurements. The measurements, made using the φ angle oscillating method, provide more detailed and reliable data than those with the φ angle fixed. Diffraction studies show that the influence of thermal fatigue on the lattice parameters of the alloy is very limited. The stress analysis reveals that triaxial elastic hydrostatic stress plays a major role during thermal fatigue. The magnitude of the macrostress increases with the fatigue cycles, with the stress of the γ, phase increasing more significantly than that of the γ＇ phase, and becoming fragile after many cycles. The changes in the microstrain are dependent on the reflection planes. The microstrains at the center of the sample are released by the thermal fatigue in comparison with those at the outlying locations, which has been attributed to the advance of the dislocation slips.
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