ZUO Ke-sheng， ZHANG Hai-tao， QIN Ke， CUI Jian-zhong. Effects of Casting Process Parameters on Macrostructure and Microstructure of A390 Alloy Hollow Billet Produced by DC Casting[J]. Journal of Northeastern University:Natural Science, 2015, 36(10): 1426-1430.
[1]Wang F，Ma Y J，Zhang Z Y，et al.A comparison of the sliding wear behavior of a hypereutectic Al-Si alloy prepared by spray-deposition and conventional casting methods［J］.Wear，2004，256(3/4):342-345. [2]Zuo M，Liu X F，Sun Q Q.Effects of processing parameters on the refinement of primary Si in A390 alloys with a new Al-Si-P master alloy［J］.Journal of Materials Science，2009，44(8):1952-1958. [3]Cui C，Schulz A，Schimanski K，et al.Spray forming of hypereutectic Al-Si alloy［J］.Journal of Materials Processing Technology，2009，209(11):5220-5228. [4]Leatham A.Spray forming-alloys，products and markets［J］. Metal Powder Report，1999，51(5):28-37. [5]魏长传，曹秀萍，石建业.铝及铝合金管材生产［M］.长沙:中南大学出版社，2010:5-6.( Wei Chang-chuan，Cao Xiu-ping，Shi Jian-ye.Tube manufacturing of aluminum and aluminum alloy［M］.Changsha:Central South University Press，2010:5-6.) [6]Lasa L，Rodriguez-Ibabe J M.Wear behavior of eutectic and hypereutectic Al-Si-Cu-Mg casting alloys tested against a composite brake pad［J］.Materials Science and Engineering A，2003，363，193-202. [7]Zhang Q，Li T J，Wang T M，et al.Effects of AC magnetic field on solidification structure of continuously cast hollow billet［J］.Ironmaking and Steelmaking，2009，36(2):115-119. [8]Xu C L，Jiang Q C.Morphologies of primary silicon in hypereutectic Al-Si alloys with melt overheating temperature and cooling rate［J］.Materials Science and Engineering A，2006，437:451-455.(上接第1425页)3结论1) Mg-5Li合金中加入Y后，合金中生成了稀土化合物Mg24Y5.Mg24Y5相阻碍了合金在挤压过程中动态再结晶晶粒的长大，显著细化了合金的晶粒.经过挤压变形后，Mg-5Li-xY合金中出现了明显的挤压带，合金中稀土化合物表现出沿挤压方向分布的特征.2) Mg-5Li合金中添加Y后主要产生了固溶强化、细晶强化及第二相强化，使得挤压态合金的力学性能有了较大提升.随Y质量分数的增加，合金的抗拉强度、伸长率等力学性能呈先上升后下降的趋势，Y质量分数过高时易导致合金中稀土相体积过大并发生团聚，降低了第二相强化作用.3) 挤压态Mg-5Li-3Y合金获得了较好的力学性能，其抗拉强度和断裂伸长率分别达到了231.63MPa和9.35%.合金的室温拉伸断裂方式以韧性断裂为主.
