半固态挤压铸造下稀土Y强化机械零件用ZL105铝合金的制备与性能  

Preparation and properties of semi-solid squeeze casting rare earth Y reinforced ZL105 aluminum alloy for mechanical parts

作　　者：郭红丽 李勇 Guo Hongli;Li Yong(School of Intelligent Manufacturing,Shanxi Vocational University of Engineering Science and Technology,Taiyuan 030619,China;Zhejiang Kaiying New Materials Co.,LTD.,Haining 314400,China)

机构地区：[1]山西工程科技职业大学智能制造学院,太原030619 [2]浙江凯盈新材料有限公司,浙江海宁314400

出　　处：《材料与冶金学报》2022年第6期442-447,共6页Journal of Materials and Metallurgy

基　　金：浙江省重点研发计划项目(2020A01005)。

摘　　要：利用半固态挤压铸造技术制备稀土Y强化后的机械零件用ZL105铝合金,采用光学显微镜(OM)、能谱仪(EDS)、扫描电镜(SEM)研究了不同Y添加量下的ZL105铝合金显微组织和力学性能.结果表明,Y能有效细化铸态铝合金的晶粒,随着Y添加量的增加,α-Al晶粒和Al-Fe-Mn-Si相尺寸均先减小后增大,铝合金硬度、抗拉强度和伸长率均先增大后减小.当Y添加量(质量分数)为0.4%时,铝合金微观组织细化程度最高,稀土相分布在晶间,α-Al晶粒尺寸约为26μm,呈椭球状,Al-Fe-Mn-Si相尺寸减小到22μm,由长针状细化为短棒状,铝合金硬度(HV)达到108.2,抗拉强度为278.6 MPa,伸长率为5.8%;拉伸断口主要由韧窝和一定量的解理面组成.The ZL105 aluminum alloy for rare earth Y reinforced mechanical parts was prepared by means of semi-solid squeeze casting technology.The microstructure and mechanical properties of ZL105 aluminum alloy with different rare earth Y addition were studied by optical microscope(OM),energy dispersive spectrometer(EDS)and scanning electron microscope(SEM).The results show that rare earth Y can effectively refine the grains of as cast aluminum alloy.The size ofα-Al and Al-Fe-Mn-Si phase decreased first and then increased,and the hardness,tensile strength and elongation increased first and then decreased.When the content of rare earth Y is 0.4%,the microstructure refinement of aluminum alloy is the most obvious,and the rare earth phase is distributed between grains.The size ofα-Al is about 26μm,which is ellipsoidal.The size of Al-Fe-Mn-Si phase is reduced to 22μm,which is refined from long needle shape to granular,the hardness(HV)reaches 108.2,the tensile strength is 278.6 MPa,the elongation is 5.8%,and the tensile fracture is mainly composed of dimples and a certain number of cleavage surfaces.

关 键 词：机械零件 稀土Y Al-Fe-Mn-Si相 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]