(大連理工大學(xué) 材料科學(xué)與工程學(xué)院，遼寧 116024)
摘 要: 以Mg-8%Li-3%Al合金為基體，研究合金化元素Ca以及Ca與電磁攪拌復(fù)合作用對(duì)其凝固組織和力學(xué)性能的影響，并探討其化學(xué)成分、組織結(jié)構(gòu)和力學(xué)性能間的關(guān)系。結(jié)果表明：合金化元素Ca以及Ca與電磁攪拌復(fù)合作用都能改善Mg-8%Li-3%Al合金的凝固組織和力學(xué)性能；當(dāng)鑄態(tài)合金中Ca含量為0.5%(質(zhì)量分?jǐn)?shù))時(shí)，合金中β相細(xì)小均勻，室溫抗拉強(qiáng)度和伸長率分別達(dá)到188.93MPa和11.35%；施加80 V電磁場(chǎng)電壓以及加入0.5%Ca后，晶粒組織均勻有序，布氏硬度、抗拉強(qiáng)度和伸長率分別為67.5HB、203.8MPa和7.7%。
關(guān)鍵字: Mg-Li-Al合金；電磁攪拌；凝固組織；力學(xué)性能
microstructures and mechanical properties of Mg-Li-Al alloys
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Abstract:The effects of Ca and combined electromagnetic stirring and Ca on the microstructures and mechanical properties of Mg-8%Li-3%Al alloys were studied, and the relationships among the chemical composition, microstructures and mechanical properties were discussed. The results show that both Ca and combined electromagnetic stirring and Ca improve the microstructures and mechanical properties of Mg-8%Li-3%Al alloys. Adding 0.5% Ca into the as-cast alloys, the β phase becomes thinner, and the tensile strength and elongation reach to 188.93 MPa and 11.35%, respectively. The microstructure is fine and uniform, and the Brinell hardness, tensile strength, and elongation are 67.5HB, 203.8 MPa and 7.7% at electromagnetic stirring of 80 V combined with 0.5%Ca.
Key words: Mg-Li-Al alloy; electromagnetic stirring; microstructure; mechanical properties
