一种Weldalite　049型Al－Li合金的时效硬化行为

来源期刊：中南大学学报(自然科学版)1996年第6期

论文作者：郑子樵 尹登峰 谭澄宇

文章页码：694 - 698

关键词：铝合金; 时效; 银; 抗拉性能

Key words：aluminum alloy; aging; silver; tensile properties

摘    要：研究了一种Weldalite049型Al－Li合金的时效硬化特性、室温拉伸性能和时效析出组织.研究结果表明,无论是在人工时效还是在自然时效条件下,所研究的合金都有很强的时效硬化能力.时效前的预变形在人工时效条件下可一定程度地促进T1相析出,但在自然时效条件下却抑制GP区的形成,减少时效硬化效果.Ag的添加促进了T6时效态T1相的析出,从而减少了T6和T8状态的强度差别.

Abstract: The age-hardening behaviour, tensile properties and microstructures of an Al-4. 59Cu0. 91Li-0.41Ag-0.42Mg-0.14Zr alloy were investigated. Results show that this alloy has obvious age-hardening response to both artificial aging and natural aging. The addition of silver promots the precipitation of T1 phase without pre-deformation, thus decreasing the difference of strength in T6 and T8 conditions. The pre-deformation prior to aging stimulates the precipitation of T1 phase to a certain extent in the artificial aging condition, and inhibites the formation of GP zones in the natural aging condition, so the strength in T3 condition is less than that in T4 condition.