研究了温轧态Al-Li-Cu-Mg-Zr合金经不同拉伸条件超塑变形后残余强度及其与空洞行为的关系结果表明在一定应变量范围内,以高的应变速率变形的试样比以低的应变速率变形的试样空洞少,残余强度高;在变形到较大的应变量时,先快后慢的两段速率拉伸变形与一段速率拉伸相比,试样中空洞少,残余强度高结合该合金变形初期发生的形变促使连续再结晶过程,讨论了拉伸条件与空洞行为及残余强度的关系
The residual strength and relation to the cavitation of as-warm rolledAl-Li-Cu-Mg-Zr alloy have been investigated after superplastic deformation under differ-ent tensile conditions. Under certain extent of strain, the specimen deformed at a high strainrate has less cavity and higher residual strength than that at low strain rate. Whiledeformation to a large strain, the specimen deformed under test at strain rates of two-stage,i.e., at a quick one first and slow down afterward, has less cavity and higher residual strengthin comparison with that of a single stage. The relationship among residual strength, cavitationand superplastic tensile conditions has been discussed by considering the deformation-in-duced continuous recrystallization occurred during the initial stage of superplasticdeformation.
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