本文研究了Al-Zn-Mg-Zr-RE(A合金)及Al-Zn-Mg-Ti(B合金)的超塑性,并用X射线小角散射方法较系统的研究了不同应变速率不同变形度的亚稳定微空洞体积分数的变化规律,同时用定量金相方法测定了稳定空洞的长大规律,实验证明:A合金亚稳定空洞体积分数比B合金高,微空洞形核速率比B合金大,但A合金的稳定空洞长大速率比B合金小,故A合金的超塑性优于B合金。
The superplasticity of the Al-Zn-Mg-Zr-RE (alloy A) and Al-Zn-Mg-Ti (alloy B), their change of volume fraction of metastable micro-cavitiesunder various reduction and strain rates, as well as the growth of stable cavitiesin them have been studied by small X-ray scattering analysis and quantitative me-tallography respectively. Experimental results show that the volume fraction ofmetastable micro-cavities of the alloy A is more than that of the alloy B, butthe growing rate of stable cavities of the alloy A is less than that of the alloyB. Thus, it is believed that the superplasticity of the al1oy A is superior to thatof the alloy B.
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