Formation of PFZ and Its Effect in a RSP AI-Li Alloy

Liang ZHEN Yuexian CUI Dezhuang YANG Department of Materials Science,Harbin Institute of Technology,Harbin,150006,ChinaShenglong DAI Guifu YU Beijing Institute of Aeronautical Materials,Beijing 100095,China

摘 要：<正> The formation of precipitation free zone （PFZ） and its effect in a RSP AI-Li alloy has been studied.The results show that PFZ is easy to form when aged at 190℃,but there is no equilibrium phase ongrain boundaries.The growth of PFZ in the alloy is different from that in conventional AI-Li alloys,The effect of PFZ is of great importance because of its large volume fraction in the alloy.It offsets thebeneficial effect of RSP,and is thought to be an important factor that leads to the poor toughnessand low ductility of RSP AI-Li alloy sheet.

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