Mechanical Properties and Thermal Conductivity of Casting Al-Zn-Si-Cu Alloys

Li Zhengwei; Chen Ming; Hao Jianfei; Chen Bin; Yu Baoyi; Li Runxia

doi:10.15980/j.tzzz.2022.05.011

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Mechanical Properties and Thermal Conductivity of Casting Al-Zn-Si-Cu Alloys
Vol. 42, Issue 5, Pages: 579-582(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.05.011

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Li Zhengwei, Chen Ming, Hao Jianfei, et al. Mechanical Properties and Thermal Conductivity of Casting Al-Zn-Si-Cu Alloys. [J]. Special Casting & Nonferrous Alloys 42(5):579-582(2022)
DOI：

Li Zhengwei, Chen Ming, Hao Jianfei, et al. Mechanical Properties and Thermal Conductivity of Casting Al-Zn-Si-Cu Alloys. [J]. Special Casting & Nonferrous Alloys 42(5):579-582(2022) DOI： 10.15980/j.tzzz.2022.05.011.

摘要

采用压铸工艺制备了Al-xZn-8Si-2Cu(x=12、14、16、18

/%)合金型材。使用OM、SEM分析Zn含量对合金微观组织形貌的影响，并进一步分析Zn含量对力学性能及导热性能的影响。结果表明，当合金中Zn含量从12%提升到18%时，固溶在α-Al基体中的Zn含量提高，对合金起到固溶强化作用，同时共晶Si尺寸增大形成尖角导致应力集中；合金的抗拉强度和屈服强度分别从345.5 MPa、263.5 MPa提高到395.4 MPa、343.8 MPa;伸长率略微降低；热导率由109.4 W/(m·K)降低到85.7 W/(m·K)。

Abstract

Al-xZn-8 Si-2 Cu（x=12

/%） alloy profiles were fabricated by die casting. The effects of different Zn contents on the microstructure morphology of the alloy were analyzed by OM and SEM

and the influence of Zn content on mechanical properties and thermal conductivity were further analyzed. The results indicate that when the Zn content of alloy is increased from 12% to 18%

the Zn solid solution in α-Al matrix is increased

playing a role of solid solution strengthening. Meanwhile

the dimension of eutectic Si phase is increased to form a sharp angle

resulting in stress concentration. The tensile strength and yield strength of the alloy are increased from 345.5 MPa and 263.5 MPa to 395.4 MPa and 343.8 MPa

respectively

and the elongation is decreased slightly. Meanwhile

the thermal conductivity is decreased from 109.4 W/（m·K） to 85.7 W/（m·K）.