A New Precipitation-Hardening Alloy Based on the Al–Cu–Ca Eutectic System

IF 2.2 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Physical Mesomechanics Pub Date : 2026-10-08 DOI:10.1134/S1029959926600187

T. K. Akopyan, I. S. Solovev, N. V. Letyagin, A. S. Fortuna, A. N. Koshmin

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Abstract

A novel heat-treatable wrought alloy (wt. %): Al–5.6Cu–0.35Ca–0.51Mn–0.29Zr was cast as a 20 mm thick flat ingot, followed by homogenization annealing and hot rolling at 450 °C to a final thickness of 2 mm. Scanning electron microscopy (SEM) confirmed that the copper solubility in the aluminum matrix reached ~5.1 wt. %, satisfying the requirements for a pronounced precipitation hardening effect. Aging at 175 °C revealed a peak hardness of 145–150 HV achieved within ~4 h, which is comparable to the commercial 2219 alloy. Transmission electron microscopy (TEM) data suggest that the hardening is due to the formation of ultrafine coherent θʹʹ phase precipitates. Intergranular corrosion (IGC) tests showed that the new alloy performs similarly to the commercial AK4–1 alloy, with a mass loss of ~2 % after 24 h and a corrosion depth of 150–200 µm. Uniaxial tensile testing after corrosive exposure revealed a 20 % reduction in tensile strength for both alloys. Notably, the fracture mechanism in the corrosion-affected zones shifted from ductile transgranular dimpled fracture to brittle intergranular mode

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一种基于Al-Cu-Ca共晶体系的新型沉淀硬化合金

将Al-5.6Cu-0.35Ca-0.51Mn-0.29Zr这一新型可热处理变形合金（wt. %）铸为20 mm厚的扁锭，经均匀退火和450℃热轧，最终厚度为2 mm。扫描电镜（SEM）证实，铜在铝基体中的溶解度达到~5.1 wt. %，满足明显沉淀硬化效果的要求。在175℃时效下，4h内达到145 ~ 150hv的峰值硬度，与2219合金相当。透射电镜（TEM）数据表明，硬化是由于超细相干θ′′相沉淀的形成。晶间腐蚀（IGC）试验表明，新合金的性能与市售AK4-1合金相似，24 h后质量损失约2%，腐蚀深度为150 ~ 200µm。腐蚀暴露后的单轴拉伸测试显示，两种合金的拉伸强度降低了20%。腐蚀影响区的断裂机制由延性穿晶韧窝断裂转变为脆性沿晶断裂

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来源期刊

Physical Mesomechanics Materials Science-General Materials Science

CiteScore

3.50

自引率

18.80%

发文量

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.