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Al—Cu—Mg合金是航空航天工业广泛使用的时效强化铝含金。合金的时效强化相S′及S相(Al_2CuMg)的研究一直是材料研究者关注的课题。晶体科学家们借助X射线衍射对它们的晶体结构及其它晶体学特征做了许多有价值的工作,但仍然有一些未知的和有争论的问题。S′相和S相的晶体学异同就是讨论的焦点之一。我们用高分辨点阵像和选区电子衍射研究了这个问题,取得了下述有意义的结果:1.通过对选区电子衍射图的分析,用矩阵方法测定了S′(和S)相与基体的取向关系,得出(100)_s′∥(100)_m,(010)_s′∥(021)_m。这个结果与Silcock用x射线衍射测得的结果一致。基体[112]_m方向的s′相与基体的高分辨点阵像(图1(a))显示它们的位向关系为(001)_s′∥(0(?)2),[(?)(?)0]_s′∥[112]_m。这即是上述典型取向关系的一个具体表述和验证。
Al-Cu-Mg alloy is a widely used aging-enhanced aluminum alloy in the aerospace industry. The research of the aging strengthening phase S ’and S phase (Al 2 CuMg) has long been the focus of researchers. Crystalline scientists have done many valuable work on their crystal structure and other crystallographic features using X-ray diffraction, but there are still some unknown and controversial issues. Crystallographic differences and similarities between S ’and S phases are one of the focuses of discussion. We have studied this problem with high-resolution lattice imaging and selected area electron diffraction and have achieved the following significant results: 1. By analyzing the selected area electron diffraction patterns, we have determined the relationship between the S ’(and S) phase and the matrix (100) _s’∥ (100) _m, (010) _s’∥ (021) _m. This result is consistent with the results of Silcock measured by x-ray diffraction. The s’ phase in the [112] _m direction and the high resolution lattice image (Figure 1 (a)) of the matrix show that their orientation relationship is (001) _s’∥ (0 (?) 0] _s’∥ [112] _m. This is a concrete expression and verification of the above typical orientation relationship.