Ce對高強Al-Cu-Li合金組織及拉伸性能的影響

Ce對高強Al-Cu-Li合金組織及拉伸性能的影響Effect of Ce on structures and tensile properties of high-strength Al-Cu-Li alloy

采用金相顯微鏡、透射電鏡、掃描電鏡及拉伸性能在測試研究0.11% Ce(質(zhì)量分數(shù))添加對一種Al-Cu-Li系高強鋁鋰合金薄板T8態(tài)時效(5%冷軋預變形+155 ℃時效)組織和力學性能的影響。結(jié)果表明：0.11% Ce添加明顯降低合金強度，但伸長率略有增加。微量Ce添加可細化鑄態(tài)晶粒組織及固溶再結(jié)晶晶粒組織；而且微量Ce添加未改變鋁鋰合金中時效析出相的種類，主要強化相仍然為T1相(Al2CuLi)及θ′相(Al2Cu)，但其數(shù)量減少。鋁鋰合金中添加微量Ce，凝固時可形成含Ce且富Cu的Al8Cu4Ce相粒子，在后續(xù)均勻化及固溶處理時均難以完全溶解，導致固溶基體中的Cu含量降低，時效時含Cu析出相T1相及θ′相含量減少，合金強度降低。

Through metalloscopy, transmission electron microscopy, scanning electron microscopy and tensile tests, the effect of 0.11% Ce (mass fraction) addition on structures and tensile properties of a high-strength Al-Cu-Li alloy with T8 aging (5% cold rolling pre-deformation and aging at 155 ℃) was investigated. The results show that the addition of 0.11% Ce significantly decreases the strength, but enhances the elongation a little. The cast structure and re-crystallized grains after solution treatment are refined by the Ce addition. The precipitate types does not change with the small addition of Ce, and the aging precipitates are still T1(Al2CuLi) and θ′(Al2Cu) phases, but their amount decreases. As 0.11% Ce is added to the Al-Li alloy, Ce-contained and Cu-rich Al8Cu4Ce particles form during solidification process, which cannot be completely dissolved into the alloy matrix during homogenization and solution process. The concentration of dissolved Cu in solid solution decreases, which decreases the fraction of T1 and θ′ precipitates and lowers the alloy strength.

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