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利用TEM对Al-6Mg-0.7Mn-0.1Zr-0.3Er合金在退火过程中Al_3(Zr_xEr_(1-x))的析出和生长行为进行了研究.结果表明:低温退火(280℃,470℃)和高温短时间退火(510℃,t≤100 h)时,Al_3(Zr_xEr_(1-x))析出相的粗化符合LSW理论(n=1/3),高温长时间退火(510℃,300 h,500 h)时,Al_3(Zr_xEr_(1-x))析出相没有进一步粗化;Al_3(Zr_xEr_(1-x))析出相的粗化主要受Er,Zr等溶质原子在α-Al基体中的扩散影响.二次析出相Al_3(Zr_xEr_(1-x))在较低温度(280和470℃)退火时均匀分布于α-Al基体中,较高温度(510℃)退火则呈线状不均匀分布.在同一退火温度下,随着退火过程的进行,Al_3(Zr_xEr_(1-x))析出相的形貌逐渐从四方体向规则的球体过渡,析出相Al_3(Zr_xEr_(1-x))中的x增大.
The precipitation and growth behavior of Al_3 (Zr_xEr_ (1-x)) during the annealing process of Al-6Mg-0.7Mn-0.1Zr-0.3Er alloy were investigated by TEM.The results show that the low temperature annealing (510 ℃, t≤100 h), the roughening of Al_3 (Zr_xEr_ (1-x)) phase complies with the LSW theory (n = 1/3) and annealing at high temperature for a long time h and 500 h), the precipitates of Al_3 (Zr_xEr_ (1-x)) phase are not further roughened. The coarsening of precipitates of Al_3 (Zr_xEr_ (1-x) (Zr_xEr_ (1-x)) were uniformly distributed in the α-Al matrix when annealed at lower temperature (280 and 470 ℃), while those at the higher temperature (510 ℃) In the same annealing temperature, the morphologies of Al_3 (Zr_xEr_ (1-x)) precipitates gradually transition from the tetragon to the regular sphere with the annealing process. The precipitates Al_3 (Zr_xEr_ (1- x)) increases.