Elevated-temperature performances of Al-Si-Cu casting alloys for cylinder head applications

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-10-24 DOI:10.1016/j.matchar.2024.114484

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Abstract

In this study, high-temperature properties of two newly developed Al-Si-Cu alloys (2Cu and 3.5Cu alloys) were investigated and compared to the commercial-grade A356 + 0.5Cu alloy (R alloy). 3.5Cu alloy exhibited the highest strength, outperforming R alloy by over 50 MPa at room temperature and by more than 20 MPa at elevated temperatures in ultimate tensile strength. However, R alloy demonstrated three to four times higher elongation than 3.5Cu alloy at room temperature, though this difference diminished at high temperatures. The minimum creep rate of 3.5Cu alloy was 2.4 times lower than that of 2Cu alloy and 14.5 times lower than that of R alloy, showing the superior creep resistance. Under low cycle fatigue loadings, the fatigue lifetimes of R and 2Cu alloys were similar, and slightly longer than that of 3.5Cu alloy. Conversely, in the high cycle fatigue regime, 3.5Cu alloy exhibited the highest fatigue resistance, followed by 2Cu and R alloys. The superior high-temperature performances of 3.5Cu alloy were attributed to the enhanced thermal stability of θ' precipitates compared to β' precipitates in R alloy, as confirmed during long-term thermal exposures at 250 and 300 °C. These findings suggest that 3.5Cu alloy is a promising candidate to replace the traditional A356 + 0.5Cu alloy for cylinder head applications.

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用于气缸盖的铝硅铜铸造合金的高温性能

本研究调查了两种新开发的铝硅铜合金（2Cu 和 3.5Cu 合金）的高温性能，并将其与商业级 A356 + 0.5Cu 合金（R 合金）进行了比较。3.5Cu 合金的强度最高，室温下的极限拉伸强度比 R 合金高出 50 兆帕以上，高温下的极限拉伸强度比 R 合金高出 20 兆帕以上。不过，R 合金在室温下的伸长率比 3.5Cu 合金高三到四倍，但在高温下这种差异会减小。3.5Cu 合金的最小蠕变率比 2Cu 合金低 2.4 倍，比 R 合金低 14.5 倍，显示出其优越的抗蠕变性。在低循环疲劳载荷下，R 和 2Cu 合金的疲劳寿命相似，略长于 3.5Cu 合金。相反，在高循环疲劳条件下，3.5Cu 合金的抗疲劳性能最高，其次是 2Cu 和 R 合金。3.5Cu 合金优异的高温性能归因于与 R 合金中的β'析出物相比，θ'析出物具有更强的热稳定性，这在 250 和 300 °C 的长期热暴露中得到了证实。这些研究结果表明，3.5Cu 合金有望取代传统的 A356 + 0.5Cu 合金，用于气缸盖应用。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.