【摘要】 研究了Ｓｃ对Ａｌ—Ｌｉ—Ｃｕ—Ｍｇ—Ｚｒ合金的显微组织与拉伸性能的影响。结果表明，δ′（Ａｌ３Ｌｉ）和Ｓ′（Ａｌ２ＣｕＭｇ）仍为含Ｓｃ合金中的主要强化相，Ｓｃ细化了合金的晶粒，降低了δ′颗粒的长大速度，促进Ｓ′相的析出和均匀弥散分布，还使合金析出Ａｌ３Ｓｃ颗粒和Ａｌ３Ｌｉ／Ａｌ３Ｓｃ复合析出相颗粒，这两种颗粒都有益于合金的性能。因此，加入Ｓｃ后合金表现出良好的强塑性配合。更多还原

【Abstract】 The effect of Sc on microstructure and tensile properties of Al-Li-Cu-Mg-Zr alloy has been studied. The results show that the δ′（Al3Li） and S′（Al₂CuMg） are main strengthening phases in the alloys-Addition of Sc may refine the grain size, reduce the coarsening rate of δ′particles and accelerate the precipitation and uniform distribution of S′phase obviously. Al₃Sc particles and composite Al₃Li / Al₃Sc particles precipitate in the Sc-containing alloys, they are beneficial to the improvement of properties. So,the Sc significantly increases the strength of the alloy, and results in superior combinations of strength and ductility.更多还原