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中文摘要：
采用微观相场方法，模拟了Ni75Al10Crl5合金分级时效中预时效温度的影响。结果表明：预时效温度较低时，L12相以非经典形核长大机制形成，DO22相以失稳分解机制形成，获得比较弥散均匀的沉淀相组织，两相尺度差异不大。随着预时效温度升高，L12相首先以失稳分解机制形成，随后DO22相在L12相的相界处以形核长大机制形成，两相尺度差异较大，L12相比D022相粗大。预时效温度升高，L12相和D022沉淀孕育期变长，颗粒密度减小。
英文摘要：
Based on the microscopic phase-field model, the first-stage ageing temperature effect of double-stage ageing is simulated for Ni75Al10Crl5 alloy. When the first-stage ageing temperature is lower, a non-classical nucleation and growth mechanism occurs for L12 phase, while the precipitated mechanism of DO22 phase is spinodal decomposition, the homogeneous and disperse precipitated phase is liable to acquire, the dimension of L12 phase is close to the DO22 phase. When the first-stage ageing temperature is higher, the precipitated mechanism of L12 phase is spinodal decomposition, while the precipitated mechanism of DO22 phase is non-classical nucleation and growth, and the dimension of L12 phase is obviously larger than that of D022 phase. The incubation period of precipitation becomes longer, and the grain densities of L12 and DO22 decrease with the increase of first-stage ageing temperature.
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