动力学分析
(洛阳工学院 材料科学与工程系， 洛阳 471039)
摘 要: 通过研究时效过程中电阻率的变化规律， 分析了Cu-3.2Ni-0.75Si-0.30Zn合金的时效析出特性及其动力学过程。 结果表明： 低温时效时扩散作用是合金析出过程的主要控制因素，时效早期通过调幅分解形成溶质原子的富集区， 然后在溶质富集区发生失稳有序化， 最后生成δ-Ni2Si相； 高温时效时相变驱动力成为主要控制因素，由于生成δ-Ni2Si相的驱动力较大， 所以直接析出δ-Ni2Si相。结合透射电镜研究了合金时效过程中显微组织的变化， 并得出了合金的时间—温度—转变曲线（即TTT曲线）。
关键字: 铜合金；时效； 动力学； 电阻率； 调幅分解
Cu-3.2Ni-0.75Si-0.30Zn alloy
（Department of Materials Science and Engineering，
Luoyang Institute of Technology，Luoyang 471039, China)）
Abstract:By studying the change of the resistivity in aging process, the kinetics of the aging process of Cu-3.2Ni-0.75Si-0.30Zn alloy was analysed. The results show that the diffusion is the main factor in the deposition of alloy, so in the early stage the enriched area is formed through spinodal decomposition, then the process of ordering is happened in those fields, and finally the phase of δ-Ni2Si is deposited. During aging at higher temperature the driving force of phase transformation becomes the main factor. For the driving force of δ-Ni2Si is higher, it can be deposited directly. The transformation of microstructure was studied with TEM, the time-temperature-transformation curve(T-T-T curve) was obtained.
Key words: copper alloy; aging; kinetics; resistivity; spinodal decompo
