细化变质对免热处理压铸Al-Zn-Si-Cu合金组织及性能的影响  

The Effect of Refinement and Modification on the Microstructure and Properties of Al-Zn-Si-Cu Alloy Die-Casting Without Heat Treatment

作　　者：张恩图 郝建飞 夏鹏 陈斌 王志鹏 揭晓华[1] 李润霞 ZHANG En-tu;HAO Jian-fei;XIA Peng;CEN Bin;WANG Zhi-peng;JIE Xiao-hua;LI Run-xia(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510000,Guangdong,China;School of Materials Science and Engineering,Dongguan University of Technology,Dongguan 523000,Guangdong,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510000 [2]东莞理工学院材料科学与工程学院,广东东莞523000

出　　处：《铸造》2024年第6期746-752,共7页Foundry

基　　金：广东省基础与应用基础研究基金区域联合基金重点项目(2022B1515120066);广东省重点建设学科科研能力提升项目(2022ZDJS030);国家自然科学基金专家推荐类原创探索计划项目(12150001);东莞市科技特派员项目(20221800500773)。

摘　　要：采用压铸成形工艺制备Al-Zn-Si-Cu合金,研究陶瓷纳米增强颗粒(TiC/TiB_(2))和Al-10Sr变质剂对免热处理压铸Al-Zn-Si-Cu合金力学性能、导热/电性能、显微组织的细化变质效果。结果表明,单独添加0.5%陶瓷纳米颗粒后,与未添加细化剂的合金相比,α-Al相得到明显细化,呈近蔷薇状,纤维状共晶Si相更加致密,短棒状Al_(2)Cu相更加细小,且Zn、Si、Cu元素在基体中含量增加,此时力学性能得到提升,导热/电性能略有下降,主要是由于溶质元素的增加导致晶格发生畸变程度变大,增大电子散射能力的同时减小电子的平均自由程,使得金属的导热和导电能力下降;经0.5%陶瓷纳米颗粒和0.1%Al-10Sr中间合金共同作用后,共晶Si相棱角钝化,基体中溶质元素含量进一步增加,此时合金力学性能达到最佳,其抗拉强度、屈服强度和伸长率分别为361 MPa,213 MPa和6.8%,热导率为118.73 W/(m·K)。Al-Zn-Si-Cu alloy was prepared by die casting process.The effect of ceramic nano-reinforced particles(TiC/TiB2)and Al-10Sr modifier on mechanical properties,thermal/electrical properties and microstructure of Al-Zn-Si-Cu alloy was studied.The results show that after adding 0.5%ceramic nanoparticles alone,the α-Al phase is obviously refined,showing nearly rose-like shape,the fibrous eutectic Si phase is denser,the short rod-like Al2Cu phase is finer,and the content of Zn,Si and Cu elements in the matrix is increased,and the mechanical properties are improved.The thermal conductivity/electrical properties decreased slightly,mainly due to the increase of solute elements led to a greater degree of lattice distortion,increasing the electron scattering ability while decreasing the mean free path of electrons,resulting in a decrease in the thermal conductivity and electrical conductivity of metals.After the co-action of 0.5% ceramic nanoparticles and 0.1% Al-10Sr,the eutectic Si phase is angular passivated,and the solutes content in the matrix further increases.At this time,the mechanical properties of the alloy reach the best,with the tensile strength,yield strength and elongation of 361 MPa,213 MPa and 6.8%,respectively.Thermal conductivity 118.73 W/(m•K).

关 键 词：免热处理压铸Al-Zn-Si-Cu合金 晶粒细化 变质处理 力学性能 显微组织 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]