不同状态Mg-9Li-3Al-2.0Gd合金的显微组织及性能
Microstructure and Properties of Mg-9Li-3Al-2.0Gd Alloy in Different States
摘 要
使用对掺法制备了铸态Mg-9Li-3Al-2.0Gd合金, 之后对其进行挤压处理, 研究了铸态和挤压态合金的显微组织、拉伸性能及耐腐蚀性能。结果表明: 铸态合金主要由α-Mg、β-Li、Al3Gd和MgAlLi2相组成; 经过挤压变形后, 合金的组织得到明显细化, 但其物相组成并没有发生变化, 只是在挤压过程中发生了完全动态再结晶; 挤压态合金的抗拉强度和伸长率分别达到了251 MPa和20.2%, 与铸态合金相比提高了39.4%和32%; 铸态合金的拉伸断口表现为韧窝断裂与解理断裂的复合型断裂特征, 而挤压态合金趋于微孔聚集型断裂; 与铸态合金相比, 挤压态合金表现出了更好的耐腐蚀性能。
显微组织
拉伸性能
耐腐蚀性能
钆元素
magnesium alloy
microstructure
tensile property
corrosion resistance
gadolinium element
Abstract
As-cast Mg-9Li-3Al-2.0Gd alloy was prepared through mixture method, and then it was treated by means of extrusion treatment. Microstructure, tensile properties and corrosion resistance of the alloy in as-cast and as extruded states were investigated. The results exhibite that the as-cast alloy was mainly composed of α-Mg, β-Li, Al3Gd and MgAlLi2 phases. After extrusion process, the grains size of the alloy was refined clearly, but its phases didn’t change, only dynamic recrystallization happened during extrusion process. Tensile strength and elongation of the extruded alloy reached to 251 MPa and 20.2%, respectively, accordingly enhanced by 39.4% and 32%(compared with the alloy in as-cast state). Tensile fracture of the as-cast alloy mainly exhibited a mixture of ductile fracture and cleavage fracture, while the extruded alloy trended to fracture with microvoid accumulation fracture characteristics. Compared with the as-cast alloy, the extruded alloy exhibited better corrosion resistance.
中图分类号 TB3 DOI 10.11973/jxgccl201612001
所属栏目 试验研究
基金项目 国家科技部“973”计划资助项目(2007CB613702) ; 重庆市自然科学基金资助项目(2008BB4323); 国家科技部国际合作项目(2010DFR50010)
收稿日期 2015/2/26
修改稿日期 2016/10/26
网络出版日期
作者单位点击查看
备注张振宇(1991-), 男, 湖南邵阳人, 硕士研究生。
引用该论文: ZHANG Zhen-yu,PENG Xiao-dong,LI Meng-luan,MA Yi,YU Yuan-qing,LI Yang-min. Microstructure and Properties of Mg-9Li-3Al-2.0Gd Alloy in Different States[J]. Materials for mechancial engineering, 2016, 40(12): 1～5
张振宇,彭晓东,李孟孪,麻毅,余远清,李杨敏. 不同状态Mg-9Li-3Al-2.0Gd合金的显微组织及性能[J]. 机械工程材料, 2016, 40(12): 1～5
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参考文献
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【3】GOLMAKANIYOON S, MAHMUDI R. Effect of aging treatment on the microstructure, creep resistance and high-temperature mechanical properties of Mg-6Zn-3Cu alloy with La- and Ce-rich rare earth additions［J］. Materials Science and Engineering A, 2015, 620: 301-308.
【4】彭晓东, 李玉兰, 刘江. 轻合金在汽车上的应用［J］.机械工程材料, 1999, 23(2): 1-4.
【5】李俊辰, 彭晓东, 刘军威,等.Mg-9Li-3Al-2.5Sr合金的热变形行为［J］.材料研究学报, 2012, 26(3): 309-314.
【6】ZENG Y, JIANG B, ZHANG M X, et al. Magnesium-lithium base alloys preparation, fabrication, and general characteristics［J］. Intermetallics, 2014, 45: 18-23.
【7】DROZD Z, ZUZANKA T, STANISLAV K. Deformation behavior of Mg-Li-Al alloys［J］. Journal of Alloys and Compounds, 2004,378(2): 92-195.
【8】ZHANG Z M, XU C J, GUO X F. Microstructure of Mg-6.4Zn-1.1Y alloy fabricated by rapid solidification and reciprocating extrusion ［J］.Acta Metal Sinica (English Letters), 2008,21:30-36.
【9】GAO P, XUE Z, LIU G B, et al. New Mg-Li based Mg-Li-Cu-(Y, Gd) BMGs: Preparation, glass forming ability and mechanical properties ［J］.Journal of Non-Crystalline Solids, 2011, 375: 2182-2186.
【10】PEND L, XING D W, AN G Y. Eutectic structure of binary Mg-Li alloy during directional solidification［J］.J Harbin Inst Technol, 1999, 30:10-12.
【11】LUO G X, WU G Q, WANG S J, et al. Effects of YAl2 particulates on microstructure and mechanical properties of β-Mg-Li alloy［J］. Journal of Materials Science, 2011, 375:2182-2186.
【12】TROJANOVA Z, DROZD Z, KUDELA S, et al. Strengthening in Mg-Li matrix composites［J］. Composites Science and Technology,2007, 67:1965-1973.
【13】HANSEN F, ESCHURMANN F. The deformation and strengthening mechanisms of the multiphase Mg-Li-Al alloys［J］. Metals,1986, 40:1-6.
【14】邓霞, 张奎, 李星刚,等.钇对纯镁的组织和性能的影响［J］.稀有金属,2012,36(1):25-30.
【15】李红斌, 姚广春, 吉海宾,等.Ca对超轻Mg-Li-Al合金显微组织和力学性能的影响［J］.铸造, 2005, 54(12): 1276-1279.
【16】MERT F, ZDEMIR A, KAINER K U, et al. Influence of Ce addition on microstructure and mechanical properties of high pressure die cast AM50 magnesium alloy［J］. Trans Nonferrous Met Soc, 2013, 23: 66-72.
【17】李俊辰. 新型Mg-Li-Al-Y合金组织、性能及热变形行为研究［D］.重庆: 重庆大学, 2013.
【18】左小军, 彭晓东, 陈德顺, 等. 锶对镁锂锌合金显微组织和力学性能的影响［J］.机械工程材料, 2014, 38(9): 58-62.
【19】RAO K P. Processing maps for hot deformation of rolled AZ31 magnesium alloy plate: Anisotropy of hot workability［J］. Materials Science and Engineering A,2008, 487(25):316-327.
【20】邓姝皓, 易丹青, 兰博, 等.热处理对镁合金负极材料组织和性能的影响［J］.电源技术, 2008, 32: 508-511.
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