Preparation of the nano-spherical eutectic Mg2Si in Ca-Sb modified Al-12Mg2Si alloy by sub rapid solidification

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-06-25 DOI:10.1016/j.intermet.2025.108894

Hong-Chen Yu , En-Ping Zhou , Qing-Peng Wang , Di-Tian Pei , Chen-Xuan Tang , Hui-Lin Suo , Yong-Hao Tian

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引用次数: 0

Abstract

Spherical eutectic Mg₂Si with particle size of ∼200 nm is prepared in 0.5 wt% Ca-Sb modified Al-12Mg₂Si alloy by sub rapid solidification (SRS) method for the first time. High cooling rate during SRS process promotes the nucleation of the eutectic Mg₂Si and the particle size is decreased. The uniform adsorption of the modifier atom (Ca and Sb atom) on the {100} facet of eutectic Mg₂Si results in the isotropic growth of the eutectic Mg₂Si, nano-spherical eutectic Mg₂Si is formed. The formation of nano-spherical eutectic Mg₂Si leads to the increasing of the fracture stress (σ_c) and smooth slip of the dislocation in the α-Al matrix. The ultimate tensile strength (UTS) is increased from ∼196 MPa (unmodified alloy at conventional solidification (CS) condition) to ∼270 MPa (Ca-Sb modified alloy at SRS condition). The elongation to failure of is also improved from ∼2.2 % (unmodified alloy at CS condition) to ∼10 % (Ca-Sb modified alloy at SRS condition). The study provides a method to regulate the size and morphology of eutectic Mg₂Si, which is beneficial to prepare the novel Al-Mg₂Si alloy with high strength and toughness.

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亚快速凝固法制备Ca-Sb改性Al-12Mg2Si合金中纳米球状共晶Mg2Si

采用亚快速凝固（SRS）方法，首次在0.5 wt% Ca-Sb改性Al-12Mg2Si合金中制备了晶粒尺寸为~ 200 nm的球状共晶Mg2Si。SRS过程中较高的冷却速率促进了共晶Mg2Si的形核，减小了晶粒尺寸。改性剂原子（Ca和Sb原子）在共晶Mg2Si的{100}面均匀吸附，导致共晶Mg2Si的各向同性生长，形成纳米球形共晶Mg2Si。纳米球形共晶Mg2Si的形成导致α-Al基体中位错的断裂应力（σc）增大和光滑滑移。极限抗拉强度（UTS）从~ 196 MPa（常规凝固（CS）条件下未改性合金）增加到~ 270 MPa （SRS条件下Ca-Sb改性合金）。断裂伸长率也从~ 2.2% （CS条件下未改性合金）提高到~ 10% （SRS条件下Ca-Sb改性合金）。该研究提供了一种调节共晶Mg2Si尺寸和形貌的方法，有利于制备高强度、高韧性的新型Al-Mg2Si合金。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.