Abstract

In the present work, the melt structure was affected by controlling the important factors of the melt holding time and cooling rate. The microstructure of the Mg₆₆Zn₃₀Gd₄ alloys prepared with different melt holding time and cooling rate was observed. It was found that the symmetrical rod phase had the highest volume fraction when the melt holding time was 40 minutes. With the increase of cooling rate, the forming capacity of the symmetrical rod phase was enhanced and refined significantly. Furthermore, the melting and decomposition process of the symmetrical rod phase was studied by resistivity experiment. During the resistivity experiment, the symmetrical rod phase in the Mg–Zn–Gd alloy underwent twice phase structure transformations in a narrow temperature ranges. With the increase of symmetrical rod phase volume fraction, the wear resistance of the Mg₆₆Zn₃₀Gd₄ alloy is enhanced.

中文翻译：

---

Mg 66 Zn 30 Gd 4合金中对称棒相形成的研究

摘要

在目前的工作中，通过控制熔体保持时间和冷却速率的重要因素来影响熔体结构。Mg ₆₆ Zn ₃₀ Gd ₄的微观结构观察到以不同的熔体保持时间和冷却速率制备的合金。发现当熔体保持时间为40分钟时，对称棒相具有最高的体积分数。随着冷却速率的增加，对称棒相的形成能力得到明显增强和细化。此外，通过电阻率实验研究了对称棒相的熔化和分解过程。在电阻率实验中，Mg-Zn-Gd合金中的对称棒相在狭窄的温度范围内经历了两次相结构转变。随着对称杆相体积分数的增加，Mg ₆₆ Zn ₃₀ Gd ₄合金的耐磨性增强。