变形工艺对LA91镁锂合金显微组织及力学性能的影响
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摘要
采用金相显微镜、X射线衍射仪、扫描电镜、单轴拉伸研究了LA91镁锂合金在不同加工状态下的显微组织和力学性能。结果表明,经挤压变形后,LA91合金的组织呈现一定的取向性,晶粒沿挤压方向被拉长。经轧制变形后,该合金的组织得到细化,出现了纤维组织,取向性更加明显。轧制态LA91合金较挤压态该合金的力学性能得到一定的提高,其抗拉强度达176 MPa,伸长率最高达到40%。
The microstructure and mechanical properties of LA91 magnesium lithium alloy was studied under different processing conditions by using optical microscopy(OM), X-ray diffraction(XRD), scanning electron microscope(SEM), and uniaxial tensile. The results show that after extrusion deformation, the microstructure of LA91 alloy presents a certain orientation and the crystal grains are lengthened along the extrusion direction. The microstructure of the alloy is refined after rolling deformation, the fiber microstructure appears and the orientation is more prominent. The mechanical properties of rolled LA91 alloy are higher than that of the extruded alloy, the tensile strength can reach 176 MPa and the elongation can reach 40%.
The microstructure and mechanical properties of LA91 magnesium lithium alloy was studied under different processing conditions by using optical microscopy(OM), X-ray diffraction(XRD), scanning electron microscope(SEM), and uniaxial tensile. The results show that after extrusion deformation, the microstructure of LA91 alloy presents a certain orientation and the crystal grains are lengthened along the extrusion direction. The microstructure of the alloy is refined after rolling deformation, the fiber microstructure appears and the orientation is more prominent. The mechanical properties of rolled LA91 alloy are higher than that of the extruded alloy, the tensile strength can reach 176 MPa and the elongation can reach 40%.
引文
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[2]李苗苗,武保林,张利,等.AZ31镁合金板材多道次轧制压下量对变形能力的影响[J].热加工工艺,2017,46(3):38-41.
[3]冯剑,黄金亮,贾玉鑫.轧制变形对Mg-12Li-3Gd-3Y-0.6Zr合金组织与性能的影响[J].热加工工艺,2014,43(4):74-76.
[4]吴洪超.超轻镁锂合金微观结构与力学性能研究[D].南京:南京理工大学,2016.
[5]李瑞红,蒋斌,陈志军,等.Y和Sr对Mg-14Li-1Al合金组织及力学性能的影响[J].热加工工艺,2016,45(14):67-70.
[6]姚玮.冷轧工艺对LZ91镁锂合金显微组织与力学性能的影响[D].湘潭:湖南科技大学,2016.
[7]秦径为,彭谦之,周海涛,等.Mg-8Li-3Al-Y镁锂合金板材热轧及退火组织与性能[J].稀有金属,2015,39(7):577-582.
[8]姜炳春,唐联耀,刘方方,等.退火对LZ91镁锂合金冷轧板材组织与力学性能的影响[J].金属热处理,2016,41(1):171-174.
[9]祖国胤,杜鹏,宋洪全,等.稀土Y对挤压态Mg-5Li合金组织及性能的影响[J].东北大学学报(自然科学版),2015,36(10):1422-1425.
[10]刘筱,刘文辉,罗号,等.冷轧中间退火对LZ91镁锂合金组织与性能的影响[J].兵器材料科学与工程,2017,40(2):91-95.
[11]王贵生,李黎忱,闫志峰,等.热处理对ZK60轧制镁合金组织与力学性能的影响[J].热加工工艺,2017,46(2):215-217.
[12]张建新,陈昊,高爱华,等.镁合金强化理论的种类及研究现状分析[J].热加工工艺,2016,45(1):16-18.
[13]Luo X M,Bi G L,Jiang J,et al.Compressive anisotropy of extruded Mg-Dy-Zn alloy sheet[J].Transactions of Nonferrous Metals Society of China,2016,26(2):390-397.