Calculation Of Crystallographhy Of Martensitic Phase Transition Of CuZnAl Alloys

The crystallography of martensite has a certain universality, and was applied to martensite transformation in most of marterial systerms. This theory is only the relationship between the phenomenons, and its object is the relationship between martensite and parent phase, that is lattice constant,lattice type,orientation relationship of the lattice and the orientation of two-phase interface and so on.The orientation relationship of before and after phase transformation of the common crystal face and crystal orientation was calculated,and the six strain groups of the transformation was also calculated.The result of crystallography of martensite in Cu-Zn-Al alloys was caculated with W-L-R theory before by many Authors. But in this article, it was be caculated with B-M theory. The result of the parameters was caculated with the improved B-M theory. The habit of martensite caculated is ( 0.09350.65610.7489), and the test value is (1 .0000 6.8800 7.9000), the angle is 0.1883°.The habit of martensite caculated by the Traditional B-M is (1 .0000 7.71151 9.323697), the angle between Calculated value and test value is 1.8°.The results caculated with improved B-M theory and traditional B-M theory are the basically same.In this paper, the crystallography of martensite of Cu-Zn-Al alloys and classic B-M theory were made a detailed presentation, improved calculation methods of tranditional B-M theory, and used calculation of vector many times. The process of calculation was intuitive, and it was easy to achieve by the computer.