Mg-10Zn-5Al-0.2Sc 合金的沉淀强化机理研究

IF 2.6 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING International Journal of Metalcasting Pub Date : 2024-07-11 DOI:10.1007/s40962-024-01406-5
A. X. Jiang, Z. Y. You, S. S. Jin, Y. G. Zhang, M. J. Zhang, K. Y. Wang
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引用次数: 0

摘要

Mg-10Zn-5Al-0.2Sc (wt%) 合金是通过重力铸造和随后的热处理制成的。使用光学显微镜、扫描电子显微镜/电子显微镜和电子显微镜/高温热电子显微镜对合金样品的微观结构和析出物进行了细致的检测。结果表明,合金的微观结构由 MgZnAl 相和少量 Al2Sc 组成。Sc 的加入细化了合金的晶粒大小,同时在微观结构中引入了空位和位错。热处理后,大量棒状纳米级 MgZnAl 和 MgZn 相在晶粒中析出,这些相在析出方向上呈现垂直关系,从而形成大量位错和平面缺陷。纳米级 MgZnAl 和 MgZn 相具有六边形紧密堆积结构,对提高热处理合金的屈服强度有显著作用(68.59%)。这些相与α-镁基体具有一定程度的相干性,阻碍了位错运动,并有效地吸收和储存了位错,从而减轻了拉伸变形过程中各相内部的应变和畸变集中。这种机制加强了相干界面的强化效果,最终提高了合金的强度和延展性。热处理后,合金的抗拉强度达到 221 兆帕,屈服强度达到 208.45 兆帕,伸长率达到 0.99%,与基体合金相比,分别提高了 33.13%、38.88% 和 0.49%。
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Study on the Precipitation Strengthening Mechanism of Mg–10Zn–5Al–0.2Sc Alloy

The Mg–10Zn–5Al–0.2Sc (wt%) alloy was fabricated through gravity casting and subsequent heat treatment. The microstructure and precipitates of the alloy samples were meticulously examined using OM, SEM/EDS, and TEM/HRTEM. The results indicate that the microstructure of the alloy comprises a MgZnAl phase along with a minor presence of Al2Sc. The incorporation of Sc serves to refine the grain size of the alloy while introducing vacancies and dislocations within the microstructure. After heat treatment, an abundance of rod-shaped nanoscale MgZnAl and MgZn phases precipitate within the grains, with these phases exhibiting a perpendicular relationship in terms of precipitation orientation, leading to the formation of numerous dislocations and planar defects. The nanoscale MgZnAl and MgZn phases, characterized by a hexagonally close-packed structure, contribute significantly (68.59%) to the enhancement of the yield strength of the heat-treated alloy. These phases demonstrate a degree of coherence with the α-Mg matrix, impeding dislocation motion, and effectively absorbing and storing dislocations, thereby mitigating strain and distortion concentrations within the phases during tensile deformation. This mechanism reinforces the strengthening effect of coherent interfaces, ultimately improving the strength and ductility of the alloy. After heat treatment, the alloy attains a tensile strength of 221 MPa, a yield strength of 208.45 MPa, and an elongation of 0.99%, representing enhancements of 33.13%, 38.88%, and 0.49%, respectively, compared to the matrix alloy.

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来源期刊
International Journal of Metalcasting
International Journal of Metalcasting 工程技术-冶金工程
CiteScore
4.20
自引率
42.30%
发文量
174
审稿时长
>12 weeks
期刊介绍: The International Journal of Metalcasting is dedicated to leading the transfer of research and technology for the global metalcasting industry. The quarterly publication keeps the latest developments in metalcasting research and technology in front of the scientific leaders in our global industry throughout the year. All papers published in the the journal are approved after a rigorous peer review process. The editorial peer review board represents three international metalcasting groups: academia (metalcasting professors), science and research (personnel from national labs, research and scientific institutions), and industry (leading technical personnel from metalcasting facilities).
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