由于β′Cu-ZnAl 合金亚稳贝氏体α_1在“过退火”时“退化”为稳定的平衡相α,而使得转变组织不单一。但在贝氏体楣变温区,当转变体积分数(x)不超过10%时,可保证获得单一的贝氏体α_1。因此,计算贝氏体相交的体转变激活能必须使 x≤10%,取 x=5%,所得激活能值为56.4kJ/mol,仅约 Zn 在β′母相中扩散激活能的1/3。因而不能认为贝氏体相变仅仅为一扩散控制的过程。 As β’Cu-ZnAl alloy metastable bainite α_1 “over anneal” when “degenerate” into a stable equilibrium phase α, making the transformation of the organization is not a single. However, in the bainite transformation zone, a single bainite α_1 can be obtained when the transformation volume fraction (x) does not exceed 10%. Therefore, to calculate the bainite body transformation activation energy must make x ≤ 10%, take x = 5%, the resulting activation energy value of 56.4kJ / mol, only about Zn in β ’matrix diffusion activation energy of 1 / 3. Therefore, it can not be considered that the bainite transformation is only a diffusion-controlled process.