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采用一种新型形变热处理方法在工业条件下制备了1420铝锂合金超塑性板材,通过高温拉伸、金相、扫描电镜观察等检测分析手段研究了该板材的超塑性能。组织观察表明,该板材具有扁平状的晶粒组织和较强的形变织构;当试样在475～525℃和5×10-4～1×10-3s-1条件拉伸时,最高伸长率为480%。通过改变变形温度和应变速率的两阶段拉伸和变形前再结晶退火处理,最高超塑性伸长率分别提高到600%和960%。
A new type of deformation heat treatment method was used to prepare 1420 Al-Li alloy superplastic plate under industrial conditions. The superplastic properties of the plate were studied by means of high-temperature tensile test, metallographic examination and scanning electron microscopy. Tissue observation shows that the plate has a flat grain structure and a strong deformation texture. When the sample is stretched at 475-525 ° C and 5x10-4-1x10-3s-1, the highest elongation The length is 480%. The maximum superplastic elongation increases to 600% and 960%, respectively, by changing the two-stage drawing of the deformation temperature and strain rate and the pre-deformation recrystallization annealing.