Abstract

A novel Mg alloys of Mg–xZn–ySb (x = 0, 2, 4, 6; y = 0, 0.2, 0.5, 0.8, 1.2) were designed and their microstructure, thermal conductivity and mechanical properties were systematically investigated in the present study. The as-cast Mg–Zn–Sb ternary alloys consist of α-Mg, Mg₄Zn₇ and Mg₃Sb₂ phases. Sb addition can refine the eutectic structure (α-Mg + Mg₄Zn₇) by the growth of Mg₄Zn₇ on Mg₃Sb₂ phases. The thermal conductivity of Mg–Zn–Sb alloys decreased with increasing Sb content. There existed an interactive effect of Zn/Sb on the thermal conductivity of the Mg–Zn–Sb alloys. The negative effect of Sb addition on thermal conductivity of alloys was getting smaller with increasing Zn content in alloys. The negative effect of Mg₃Sb₂ phases on the thermal conductivity of alloys could be weakened by the formation of weak-scattering Mg₄Zn₇ coated on Mg₃Sb₂ phases. The best refinement effect on microstructure could be obtained with 0.8 wt%Sb addition. Mg–4Zn–0.8Sb alloy possess the best comprehensive properties with thermal conductivity of over than 120 W/(m·K) and UTS of 185.6 MPa.

Graphic Abstract

中文翻译：

---

Mg-Zn-Sb 三元合金的显微组织、热导率和机械性能

摘要

设计了一种新型的 Mg-xZn-ySb (x = 0, 2, 4, 6; y = 0, 0.2, 0.5, 0.8, 1.2) 镁合金，并对其微观结构、热导率和机械性能进行了系统研究。学习。铸态的 Mg-Zn-Sb 三元合金由 α-Mg、Mg ₄ Zn ₇和 Mg ₃ Sb ₂相组成。添加 Sb 可以通过在 Mg ₃ Sb ₂上生长 Mg ₄ Zn ₇来细化共晶结构（α-Mg + Mg ₄ Zn ₇）阶段。Mg-Zn-Sb 合金的热导率随着 Sb 含量的增加而降低。Zn/Sb 对 Mg-Zn-Sb 合金的热导率存在交互作用。随着合金中Zn含量的增加，Sb添加对合金热导率的负面影响越来越小。镁的负面影响₃的Sb _2个相对合金的热导率可以通过弱散射的Mg的形成减弱₄的Zn ₇涂覆在镁₃的Sb ₂阶段。添加 0.8 wt% Sb 可获得对微观结构的最佳细化效果。Mg-4Zn-0.8Sb 合金具有最佳的综合性能，热导率超过 120 W/(m·K)，UTS 为 185.6 MPa。

图形摘要