浆料制备工艺对Al-17Si-4Cu-0.5Mg合金组织性能的影响  

Effects of Slurry Preparation Process on Microstructure and Mechanical Properties of Hypereutectic Al-17Si-4Cu-0.5Mg Alloys

作　　者：郝建飞[1] 罗惠馨 史原脊 于宝义[1] 李润霞 Hao Jianfei;Luo Huixin;Shi Yuanji;Yu Baoyi;Li Runxia(School of Material Science and Engineering,Shenyang University of Technology;School of Material Science and Engineering,Dongguan University of Technology)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]东莞理工学院材料科学与工程学院,广东东莞523808

出　　处：《特种铸造及有色合金》2021年第2期198-202,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51674168);辽宁省教育厅重点资助项目(201724112);辽宁省创新型人才资助项目(LN2017057)。

摘　　要：研究了浆料制备工艺对和浇注温度对Al-17Si-4Cu-0.5Mg合金显微组织及力学性能的影响。结果表明,经电磁搅拌后,合金中的Si相发生钝化,但出现了聚集现象。超声振动处理后合金中的初生Si尺寸减小,形貌由树枝状转变为近球形。Si相颗粒数量为460个/mm^(2),圆整度为0.64,平均晶粒尺寸为15.7μm。当浆料浇注温度从620℃降到600℃时,合金组织得到明显细化,继续降低浇注温度,晶粒长大,组织存在孔洞缺陷。浆料温度为600℃时,合金抗拉强度为194MPa,伸长率为2.60%,硬度(HB)为120.2,与580℃下浇注相比分别提高了10.23%、6.12%和16.83%。此时,合金断口处韧窝数量增多,解理平台尺寸减小。The effects of slurry preparation process and pouring temperature on the microstructure and mechanical properties of Al-Si-Cu-Si alloys were investigated.The results reveal that the Si phase in the alloy is passivated,however aggregation occurs after electromagnetic stirring.The size of primary Si is decreased after ultrasonic vibration treatment,of which the morphology is converted from dendrite to nearly sphericity.The count per unit area of Si phase particles reaches 0.46×10^(3)/mm^(2)with the roundness of 0.64,and the average grain size is 15.7μm.As the pouring temperature of slurry decreased from 620℃to 600℃,the microstructure is significantly refined,and the grain is coarsened as the decreasing in pouring temperature,with pore defects existing in the microstructure.When the slurry temperature is 600℃,the tensile strength of the alloy is 194 MPa,the elongation is 2.60%,and the hardness is 120.2 HB,which are improved by 10.23%,6.12%and 16.83%,respectively,compared with those of ones at 580℃.Meanwhile,the amount of fracture dimples is increased and the size of cleavage platform is decreased.

关 键 词：浆料制备工艺 半固态挤压铸造 AL-SI-CU-MG合金 微观组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.2[金属学及工艺—金属材料]