In situ evaluation of high temperature creep deformation behavior of single-crystal nickel-based superalloy

用中子衍射法研究了单晶镍基高温合金蠕变试样中晶体学取向的位置分布。随着蠕变时间的延长，晶体的局部旋转和晶体取向的展宽逐渐增加。由于合金的断裂发生在有局部晶体转动的位置附近，因此，局部晶体转动可以用来确定断裂前的损伤位置。通过中子衍射表明了损伤局部化的可能性，从而能够促进无损测量的空间映射。

The positional distribution of crystallographic orientation in single-crystal nickel-base super-alloy specimens with creep deformation was evaluated by neutron diffraction. The local crystal rotation and the broadening of crystallographic orientation increased gradually with the creep time. The local crystal rotation can be used to specify the damage location before rupture, because the rupture of alloy was generated near the place with local crystal rotation. The possibility in a localization of damage was shown by neutron diffraction that the spatial mapping of the nondestructive measurement was able to be facilitated.