对 Cu-40at.-%Zn 合金贝氏体相变温度范围内各种可能相变的驱动力进行了计算。结果表明,由于在这温度范围内存在β→β′有序相变,因而相变驱动力ΔG~(β′→α′)及ΔG~(β′→β_1′+α)随温度下降反而增大,且ΔG~(β′→α′)>0,ΔG~(β′→β_1′+α)<0;而且各成分合金β′及α′两相平衡温度 T_0,远低于 B_s 实验值,所以贝氏体相变只能按β′→β_1′+α扩散型相变进行。 The driving forces for various possible phase transitions in the Cu-40at .-% Zn alloy bainite transformation temperature range were calculated. The results show that due to the existence of β → β ’ordered transformation in this temperature range, the driving forces ΔG ~ (β’ → α ’) and ΔG ~ (β’ → β_1 ’+ α) ΔG ~ (β ’→ α’)> 0, ΔG ~ (β ’→ β_1’ + α) <0, and the equilibrium temperatures T_0 of the two phases β ’and α’ of each component alloy are much lower than the experimental values ​​of B_s , So bainite transformation can only be β ’→ β_1’ + α diffuse phase transition.