On the Improved Mechanical Properties and Corrosion Resistance in LM6 Alloy Through Eutectic Modification

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

JOM Pub Date : 2025-02-07 DOI:10.1007/s11837-025-07131-6

Pawan Bohane, Suresh Bandi, R. Karthikeyan, Pallavi Deshmukh, Trushar B. Gohil, Ajeet K. Srivastav

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Abstract

The present study investigates the effect of microstructure modification on the mechanical properties and corrosion resistance of the near-eutectic LM6 Al-Si alloy. The addition of 130 ppm of Sr significantly modifies the microstructure, transforming the flake-like morphology of eutectic Si into a fine fibrous form, promoting the formation of equiaxial dendrites of α-Al and reducing the size of the flake-like β-phase. These changes result in improved mechanical properties, including an increase in yield strength (106–113 MPa), ultimate tensile strength (155–174 MPa), and elongation (2.6–3.2%). Fractography analysis reveals that the LM6-Sr alloy exhibits a ductile fracture mode, whereas the unmodified LM6 alloy fails in a brittle manner. Despite a slight increase in porosity from 2.8% to 4.7%, the morphological modifications dominate the negative impact of porosity, resulting in an overall increase in mechanical properties. Additionally, the corrosion resistance of the LM6-Sr alloy was significantly improved, with a reduction in corrosion rate from 0.0593 mm/year to 0.0266 mm/year. Electrochemical impedance spectroscopy studies further confirmed enhanced corrosion resistance, showing higher charge transfer resistance (R_ct), oxide resistance (R_ox), and total impedance (Z_mod) for the LM6-Sr alloy.

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通过共晶改性提高LM6合金的力学性能和耐蚀性

研究了组织改性对近共晶LM6 Al-Si合金力学性能和耐蚀性的影响。添加130 ppm的Sr显著改变了共晶Si的微观结构，使片状Si转变为细纤维状，促进α-Al等轴枝晶的形成，减小了片状β相的尺寸。这些变化改善了材料的机械性能，包括屈服强度（106-113 MPa）、极限抗拉强度（155-174 MPa）和伸长率（2.6-3.2%）的提高。断口形貌分析表明，LM6- sr合金呈现韧性断裂模式，而未改性的LM6合金呈现脆性断裂模式。尽管孔隙度从2.8%略微增加到4.7%，但形态改变主导了孔隙度的负面影响，导致整体力学性能增加。此外，LM6-Sr合金的耐腐蚀性能显著提高，腐蚀速率从0.0593 mm/年降低到0.0266 mm/年。电化学阻抗谱研究进一步证实了LM6-Sr合金的耐蚀性增强，显示出更高的电荷转移电阻（Rct）、氧化电阻（Rox）和总阻抗（Zmod）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

JOM 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.80%

发文量

540

审稿时长

2.8 months

期刊介绍： JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.