首页|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

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

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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/TiB2)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Al2Cu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361MPa，213 MPa和6。8％，热导率为118。73 W/(m·K)。
The Effect of Refinement and Modification on the Microstructure and Properties of Al-Zn-Si-Cu Alloy Die-Casting Without Heat Treatment
Al-Zn-Si-Cu alloy was prepared by die casting process.The effect of ceramic nano-reinforced particles(TiC/TiB2)and Al-l0Sr 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,theα-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).

die casting Al-Zn-Si-Cu alloy without heat treatmentgrain refinementdeterioration treatmentmechanical propertiesmicrostructure

张恩图、郝建飞、夏鹏、陈斌、王志鹏、揭晓华、李润霞

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广东工业大学材料与能源学院,广东广州 510000

东莞理工学院材料科学与工程学院,广东东莞 523000

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

广东省基础与应用基础研究基金区域联合基金重点项目广东省重点建设学科科研能力提升项目国家自然科学基金专家推荐类原创探索计划项目东莞市科技特派员项目

2022B15151200662022ZDJS0301215000120221800500773

2024

铸造
沈阳铸造研究所 中国机械工程学会铸造分会

铸造

CSTPCD
影响因子：0.499
ISSN：1001-4977
年,卷(期)：2024.73(6)
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