研究了微量钪对Al-Zn-Mg-Cu-Zr合金组织性能的影响,钪在铝合金中主要以2种形式的化合物存在,一种是合金凝固时从熔体中析出的一次Al3(Sc,Zr)相,另一种是合金铸锭均匀化时析出的二次Al3(Sc,Zr)相,前者是α(Al)晶粒细化剂,有效细化铸态晶粒,而二次Al3(Sc,Zr)粒子强烈钉扎晶粒内位错及亚晶界,有效阻止热轧、退火或固溶处理过程中合金再结晶.钪是产生强烈析出强化效应的合金元素,含0.30%Sc的Al-Zn-Mg-Cu-Zr合金的抗拉强度和延性显著高于不加钪的铝合金.
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