本文使用H-700TEM双倾样品台,以μ相的α~*和[110]~*为轴旋转晶体,分别得到了一系列不同取向的倒易面衍射花样。根据衍射无系统消光现象及衍射倒易面出现的规律,可以确定GH302合金析出的μ相是简单六角点阵,a=4.75(?),c=25.8(?)。它是[001]方向有严重堆垛层错的一种缺陷结构。
According to the facts of no systematic extinction and the sequencc of the occurrence of the reciprocal planes in a series of electron diffraction patterns obtained by tilting around the [110]~* and a~* axes of μ-phase, the lattice type of μ-phase in the superalloy GH302 has been determined tobe a simple hexagonal lattice with severe stacking faults in [001] direction and having the lattice parameters of a=4.75 (?) and c=25.8 (?).
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