双相协同增强热挤压 Mg-8Gd-1Er-8Zn-1Mn 合金的机械性能和导热性能

IF 15.8 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Xudong Li, Wenbo Du, Feng Lou, Ning Ding, Xian Du, Shubo Li
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引用次数: 0

摘要

镁合金的力学性能与导热性能之间的矛盾是其广泛应用的障碍。在本研究中,我们通过双相、w相和α-Mn的协同强化,开发了一种高强、高导热的热挤压Mg-8Gd-1Er-8Zn-1Mn合金。在300℃条件下挤压得到的合金屈服强度和伸长率分别为372 MPa和12%,导热系数为134.3W/(m·K)。挤压后,合金中原始的粗w相被破碎成近球形颗粒,降低了电子散射的概率。此外,大量溶质原子以纳米棒状w相和α-Mn的形式动态析出,使α-Mg基体恢复到近周期排列状态。合金的高屈服强度主要由晶界强化以及w相和α-Mn双相强化决定。值得注意的是,双相强化策略为开发组织功能一体化镁合金提供了一条有价值的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dual-phase synergistically enhancing mechanical properties and thermal conductivity of hot-extruded Mg-8Gd-1Er-8Zn-1Mn alloy
The contradiction between mechanical properties and thermal conductivity of magnesium alloys is a roadblock for their widespread applications. In this study, we developed a hot-extruded Mg-8Gd-1Er-8Zn-1Mn alloy with high-strength and high-thermal-conductivity via dual-phase, W-phase and α-Mn, synergistically strengthening. The alloy extruded at 300 °C exhibited the yield strength and elongation of 372 MPa and 12%, respectively, it simultaneously demonstrated a high thermal conductivity of 134.3W/(m·K). After extrusion, the original coarse W-phase in the alloy was broken into near-spheroidal particles, which reduced the probability of electron scattering. In addition, a large number of solute atoms dynamically precipitated in the form of nanoscale rod-like W-phase and α-Mn, making α-Mg matrix revert to a nearly periodic arrangement state. The high yield strength of the alloy is predominantly determined by grain boundary strengthening as well as W-phase and α-Mn dual-phase strengthening. Notably, the strategy of dual-phase strengthening provides a valuable approach for developing structure-function integrated Mg alloys.
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来源期刊
Journal of Magnesium and Alloys
Journal of Magnesium and Alloys Engineering-Mechanics of Materials
CiteScore
20.20
自引率
14.80%
发文量
52
审稿时长
59 days
期刊介绍: The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.
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