Squeeze casting of 4032 aluminum alloy and the synergetic enhancement of strength and ductility via Al-Ti-Nb-B grain refiner

材料科学 合金 共晶体系 极限抗拉强度 铸造 冶金 成核 延展性(地球科学) 微观结构 粒度 锻造 降水 延伸率 6063铝合金 卤化 相(物质) 变形(气象学) 复合材料 蠕动 化学 物理 有机化学 气象学
作者
Chenxing Zhang,Wanneng Liao,Zhongde Shan,Wenzhe Song,Xixi Dong
出处
期刊:Materials Science and Engineering A-structural Materials Properties Microstructure and Processing [Elsevier BV]
卷期号:896: 146233-146233 被引量:3
标识
DOI:10.1016/j.msea.2024.146233
摘要

The 4032 aluminum alloy is a high-Si deformation aluminum alloy, that is commonly generated through forging due to the difficulties involved in its direct casting. In this work, the 4032 aluminum alloy is innovatively prepared via a squeeze casting process, and the Al-6Nb-1.5Ti-0.5B refining agent is incorporated to enhance its mechanical properties. A range of analytical techniques are subsequently employed to analyze the grain refinement mechanism of Al-6Nb-1.5Ti-0.5B under squeeze casting conditions. It was found that the microstructure of the aged 4032 aluminum alloy after refinement treatment was mainly composed of α-Al grains measuring <100 μm in size, in addition to a eutectic Si phase, that is accompanied by stacked dislocations and diffusely distributed Q′-Al5Cu2Mg8Si6 and θ′-Al2Cu phases. The yield strength of the alloy reached 340 MPa, its tensile strength was 404 MPa, and the elongation was 4.1 %. In the presence of the Al-6Nb-1.5Ti-0.5B refiner, the generation of nucleation cores (e.g., MAl3(M = Ti, Nb)) in the melt led to a significant reduction (∼50 %) in the α-Al grain size of the aged 4032 aluminum alloy (i.e., 95.1 ± 21.0 μm), compared with the standard alloy. After the T6 heat treatment of the refined 4032 aluminum alloy, the size of the precipitation phase was reduced by 36.8 %, and fine silicon particles with a spherical morphology and a more random distribution were observed. No obvious selective orientation was detected, and the fracture morphology improved significantly, thereby leading to a synergistic improvement in the strength and toughness of the alloy.
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