Mg含量对AlSi_(10)Sn_(4)Mg_(x)合金阻尼和力学性能的影响  

Effect of Mg content on damping and mechanical properties of AlSi_(10)Sn_(4)Mg_(x)alloy

作　　者：许吉 王志磊 赵帆[1,2,3] 张志豪 XU Ji;WANG Zhilei;ZHAO Fan;ZHANG Zhihao(Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Key Laboratory for Advanced Materials Processing(MOE),University of Science and Technology Beijing,Beijing 100083,China;Northeast Light Alloy Co.,Ltd.,Harbin 150060,China)

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]北京科技大学材料先进制备技术教育部重点实验室,北京100083 [3]东北轻合金有限责任公司,哈尔滨150060

出　　处：《工程科学学报》2023年第12期2049-2058,共10页Chinese Journal of Engineering

基　　金：佛山市核心技术攻关资助项目(1920001000409)。

摘　　要：研究了AlSi_(10)Sn_(4)Mg_(x)(x为质量分数0~4.0%)合金的力学性能与阻尼性能,并从Mg对Al/Sn润湿性、Mg对合金组织的影响等方面分析了阻尼和力学性能提高机制.力学性能测试结果表明,当Mg质量分数为0~1.0%时,试样的抗拉强度随着Mg含量的增加而提高、断后伸长率变化较小,Mg质量分数为1.0%试样的抗拉强度为161 MPa、断后伸长率为3.4%;继续增加Mg含量,试样的抗拉强度显著提高,但断后伸长率明显降低.试样的阻尼性能随Mg含量的增加先提高后降低,Mg质量分数为1.0%试样的阻尼性能较高,且具有良好的高温和高频阻尼性能,25℃/1 Hz、200℃/1 Hz和25℃/40 Hz条件下阻尼损耗因子tanh分别达到0.038、0.058和0.069.少量Mg的加入使Al/Sn润湿性明显提高,促使β-Sn相沿晶界呈细小弥散分布;同时,少量的Mg使AlSi_(10)Sn_(4)Mg_(x)中的共晶Si相变质球化,并生成Mg2Si强化相,是合金阻尼和力学性能提高的主要原因.Damping alloys serve as key materials in the domain of shock and noise reduction and find wide-ranging applications across several industries.Aluminum alloy,a commonly used engineering material,offers distinct advantages such as low cost and light weight.However,the damping property of aluminum alloy falls short of requisite standards.Thus,efforts toward enhancing the damping and mechanical properties of cast aluminum alloy carry considerable engineering implications.In this paper,the mechanical and damping properties of AlSi_(10)Sn_(4)Mg_(x)(x mass fraction is 0-4.0%)alloy have been investigated,and the mechanisms underlying the enhancement of the damping and mechanical properties have been analyzed by examining the effect of Mg on the wettability of Al/Sn and the alloy’s structure.The results of the mechanical property test reveal that the tensile strength of the AlSi_(10)Sn_(4)Mg_(x)alloy increases proportionally with Mg mass fraction within the range of 0%to 1.0%,whereas the fracture elongation undergoes a negligible change.With the Mg mass fraction rising to 1.0%,the tensile strength of the alloy reaches 161 MPa,and the fracture elongation stands at 3.4%.Subsequent increases in Mg content lead to remarkable enhancements in the strength of the samples.When the Mg mass fraction increases to 1.5%,the tensile strength of the alloy stands at 188 MPa,albeit with a remarkable decrease in fracture elongation.The damping properties of the alloy initially increase and subsequently decrease with the increase in Mg mass fraction.The alloy containing 1.0%Mg displays excellent damping properties at high temperatures and high frequencies.Specifically,the damping loss factor tanh at 25℃/1 Hz,200℃/1 Hz and 25℃/40 Hz measures 0.038,0.058,and 0.069,respectively.Further research suggests that the addition of a small amount of Mg can effectively improve the wettability of Al/Sn.The mean wetting angles of AlSi10 and AlSi10Mg1 alloy samples with pure Sn are 141.2°and 116.8°,respectively.The exceptional wettability of Al/

关 键 词：铸造铝合金 β-Sn Mg微合金化 阻尼性能 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]