Microstructures and mechanical properties of grain refined Al-Li-Mg casting alloy by containing Zr and Ti.
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Mechanical properties and microstructures of various Al-Li-Mg alloy castings containing small amount of Zr and/or Ti were investigated. The δ (AlLi) phase was observed to crystallize in the dendrite-cell gaps as well as on the grain boundaries. Microsegregation of Mg also occured in the solidified castings. The β (Al3Zr) or Al-Zr-Ti compounds crystallize during solidification and remain even after solid solution treatment at 803K for 36ks. The grain sizes of Al- 2.5%Li-2%Mg alloy castings become finer by the addition of 0.15%Zr and 0.12%Ti compared with each addition of 0.15%Zr or 0.12%Ti. The age hardning is accelerated by the addition of 0.15%Zr. In an Al-2.5%Li-2%Mg-0.15% Zr-0.12%Ti alloy casting poured into a metallic mold and aged at 453K for 36ks, ultimate tensile strength, Young's modulus and density were 417MPa, 80GPa and was 2.52g/cm3, respectively. Its specific strength and modulus are higher by 50.3 and 13.9% than those of the conventional AC4C-T6 casting.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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