与钢相似, β黄铜等温处理获得的片状α1(贝氏体)和棒状α都具有自己的C曲线; 各转变初期均能获单一相, 而转变中、后期通常可获相邻两相的复合体. 必须用单一相和Arrhenius关系求相变产物的体激活能. 用体激活能、相的形貌和体自由能变化相结合能可诠释下述论点: 片状α1(贝氏体) 是溶质原子扩散控制下母相β' 中的贫溶质区, 进行“军队型”原子无扩散马氏体样切变相变; 棒状α是溶质原子扩散控制下母相β' 中的最贫溶质区, 发生“平民型”原子无扩散界面控制相变.
Similarly to steels, in the isothermally treated $\beta$ brasses, the plate-like α1 (bainite) and rod-like α have all themselves C curves. A single phase is always produced in the primary stage, whereas the nearby two-phase complex is usually produced in the medium or final stage of the transformation. Only a single phase and Arrhenius equation must be used to deduce the overall activation energy for the transformation product. By a combination of overall activation energy, morphology and change of free energy, it can be explained that the plate-like α1 (bainite) transformation mechanism follows military atom diffusionless martensite-like shear, occurring in solute-depleted region controlled by solute atom diffusion in parent phase β', and the rod-like α phase results from civilian atom diffusionless interphase control transformation, occurring in the most solute-depleted region controlled by solute atom diffusion in parent phase β'.
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