微量Ce和Ti对AlCuMgAg合金组织和性能的影响

Effect of Ce and Ti Doping on Microstructure and Properties of the Alloy AlCuMgAg

摘要:

采用拉伸测试和显微组织分析，研究了微量Ce和Ti对AlCuMgAg合金组织和性能的影响。结果表明，添加Ce或Ti，能加速合金的时效硬化。提高合金室温抗拉强度，但只有添加Ce能提高合金的高温耐热性能；显微组织分析表明。Ce或Ti的添加并不改变强化析出相的种类，但能细化析出相。提高其密度。同时添加Ce和Ti，合金中形成了1种新的硬而脆的AlTiCeCu金属间化合物相，降低了合金的时效硬化和拉伸强度，使强化析出相的析出受到抑制。

Abstract:

The microstructure and mechanical properties of AlCuMgAg doped with Ce and Ti were investigated by tensile testing and microstructure analysis. It is shown that Ce and Ti doping increases the hardness and improves the tensile strength. Moreover, the Ce doping can improve the heat resistance of the alloy. By microstructure analysis, it is shown that the kinds of the precipitation- strengthening phases are not changed, although they decrease in size and increase in density. When both Ce and Ti were doped into the AlCuMgAg alloy, a new AlTiCeCu compound that is harder and brittle is formed, the precipitated phases were inhibited, and the tensile strength of the alloy decreased.