摘要
制备了不同Ca含量的AM60-x Ca(x=0.8,1.6,3.2)镁合金,运用荧光光谱仪(XRF)、X射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪和万能材料试验机等研究了Ca添加量对AM60镁合金微观组织和力学性能的影响。结果表明,随着Ca元素的加入,合金中出现了骨骼状的Al_(2)Ca第二相,当Ca含量达到3.2%时,合金中的第二相全为Al_(2)Ca,且呈网状分布。随着Ca元素含量的增加,AM60镁合金的抗拉强度先增加后降低,而伸长率逐渐降低,在Ca含量为1.6%时,合金抗拉强度达到最大值126.8 MPa。Ca元素通过细晶强化、固溶强化和第二相强化提高了AM60镁合金的抗拉强度,但脆性Al_(2)Ca相在AM60镁合金晶界呈连续的网状分布严重降低了AM60-3.2Ca的抗拉强度。同时,脆性相Al_(2)Ca对塑性的提高不利,随着Ca含量增加,Al_(2)Ca相变得粗化,导致AM60-xCa的塑性降低。
AM60-xCa(x=0.8,1.6,3.2)magnesium alloys with different Ca contents were prepared by electric resistance furnace.The XRF,XRD,SEM,EDS and mechanical properties test were used to study the effects of Ca addition on the microstructure and mechanical properties of AM60.The results show that with the addition of Ca element,the second phase of bone-like Al_(2)Ca appears in the alloy.When the Ca content reaches 3.2%,the second phase in the alloy is all Al_(2)Ca and is distributed in a network.With the increase of Ca content,the tensile strength of AM60 Mg alloy increases first and then decreases,and the elongation decreases gradually.When the Ca content is 1.6%,the tensile strength of the alloy reaches the maximum value of 126.8 MPa.The addition of Ca element improves the tensile strength of AM60 magnesium alloy by the combination of fine grain strengthening,solid solution strengthening and second phase strengthening.However,the brittle Al_(2)Ca phase continuously distributes in the grain boundary of AM60-3.2Ca,which results in the decrease of tensile strength.At the same time,the brittle phase Al_(2)Ca is unfavorable for the improvement of plasticity,and the Al_(2)Ca phase becomes coarse with the increase of Ca content,which ultimately leads to the decrease of the plasticity of AM60-xCa.
作者
姜超
徐绍勇
严军
JIANG Chao;XU Shaoyong;YAN Jun(Department of Electromechanical Engineering,Hubei Polytechnic University,Huangshi 435003,China)
出处
《热加工工艺》
北大核心
2021年第14期36-39,共4页
Hot Working Technology
基金
湖北省教育厅科学技术研究资助项目(B2018246)。
