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测定了Cu-27.27 Zn-3.73 Al Wt-%合金直接从高温母相淬火至中温的等温转变曲线.用金相、X-射线和电镜对直接淬火和从DO_3有序母相上淬至中温的转变产物做了形貌与结构的观察和分析.实验表明,依照转变产物,可将两个分离相接的c曲线分为三个区间:棒状α相,α相与片状贝氏体的混合组织,片状贝氏体.上淬所形成的贝氏体与直接淬火的贝氏体形貌相同.随时效时间的延长,贝氏体逐渐变成α相,它与从母相平衡析出的α相的点阵常数没有差别,由B2和DO_3母相所形成的贝氏体为接近正交的长周期结构,而且DO_3母相所形成的马氏体为单斜结构,它们分别对应(1210)与(2010)衍射峰的重叠和分离,表示前者的有序度较低.
The isothermal transformation curve of Cu-27.27 Zn-3.73 Al Wt-% alloy quenched directly from high temperature to moderate temperature was determined.The direct quenching and the quenching from DO 3 ordered parent phase to medium temperature by metallography, X-ray and electron microscope The transformation products were observed and analyzed by morphology and structure.The experimental results show that according to the transformation products, two separate c curves can be divided into three sections: rod α phase, α phase and flake bainite Tissue, flaky bainite.The bainite formed by the quenching is the same as the bainite quenched directly.With the aging time, the bainite gradually becomes αphase, which is in equilibrium with the bainite The lattice constants of the α phase are not different. The bainite formed by the B2 and DO_3 parent phases is a nearly orthogonal long period structure, and the martensite formed by the DO_3 parent phase is a monoclinic structure corresponding to (1210 ) And (2010) diffraction peaks overlap and separation, indicating that the former degree of order is low.