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SrO-Fe2O3变质处理和热处理对Al-19Si合金组织及性能的影响

作者:时间:2025-08-06点击数:


全文下载: 202504012.pdf


文章编号: 1672-6987(2025)04-0084-07DOI: 10.16351/j.1672-6987.2025.04.012

严建强1 陈永炜1 王志勇2 楼平2 李响2 吴松2 殷志敏2 吴昊3 何卫3*1.浙江泰仑电力集团有限责任公司送变电工程分公司, 浙江 湖州 313099;2.国网浙江省电力有限公司湖州供电公司, 浙江 湖州 313000;3.国网电力科学研究院武汉南瑞有限责任公司, 湖北 武汉 430074)

摘要: 过共晶铝硅合金由于硅含量高,因此具有高的硬度、强度、耐磨性以及低的热膨胀系数。但未经细化处理时,过共晶铝硅合金中的初晶硅和共晶硅的平均尺寸较大,合金的性能反而下降。以Al-19Si为研究对象,通过添加适量的SrO-Fe2O3对其进行变质细化处理,并对变质细化处理后的合金进行固溶和时效处理,以进一步提高合金的性能。研究结果表明,当SrO-Fe2O3粉末的添加量为0.3%时,Al-19Si合金中Si的综合细化效果最佳:初晶硅平均尺寸为52.6 μm,共晶硅的平均尺寸为9.7 μm;此时,Al-19Si合金的硬度和抗拉强度分别为89.2 HB和170.1 MPa,相比于未变质的Al-19Si合金,提升率高达23.7%和47.3%。对变质处理后的合金进行520 ℃固溶8 h,180 ℃时效8 h后,合金中的Si明显球化;合金的力学性能进一步提高:硬度达到91.2 HB,抗拉强度达到183.6 MPa。


关键词: 变质处理; 过共晶铝硅合金; 显微组织; 力学性能


中图分类号: TF 821        文献标志码: A


引用格式: 严建强, 陈永炜, 王志勇, . SrO-Fe2O3变质处理和热处理对Al-19Si合金组织及性能的影响[J]. 青岛科技大学学报(自然科学版), 2025, 46(4): 84-90.


YAN Jianqiang, CHEN Yongwei, WANG Zhiyong, et al. Effect of SrO-Fe2O3 modification and heat treatment on microstructure and properties of Al-19Si alloy[J]. Journal of Qingdao University of Science and Technology(Natural Science Edition), 2025, 46(4): -.

Effect of SrO-Fe2O3 Modification and Heat Treatment on Microstructure and Properties of Al-19Si Alloy

YAN Jianqiang1 CHEN Yongwei1 WANG Zhiyong2 LOU Ping2 LI Xiang2 WU Song2 YIN Zhimin2 WU Hao3 HE Wei31.Zhejiang Talent Electric Group Co.,Ltd., Transmission and Transformation Engineering Branch, Huzhou 313000, China;2.Huzhou Power Supply Company, State Grid Zhejiang Electric Power Company, Huzhou 313000, China;3.Wuhan NARI Limited Liability Company, State Grid Electric Power Research Institute, Wuhan 430074, China)

Abstract: Hypereutectic Al-Si alloy has high hardness, strength, wear resistance and low thermal expansion coefficient due to its high silicon content. However, without refinement, the average size of primary silicon and eutectic silicon in hypereutectic Al-Si alloy is larger, and the performance of the alloy cannot be optimized. In this paper, the primary silicon and eutectic silicon of Al-19Si alloy were refined by adding an appropriate amount of SrO-Fe2O3. And the modificated alloy was treated with solid solution treatment and aging to further improve the performance of the alloy. The results showed that when the addition of SrO-Fe2O3 powder was 0.3%, the optimum refinement has been obtained, with the average size of primary silicon being 52.6 μm and eutectic silicon being 9.7 μm. The hardness and the tensile strength of Al-19Si alloy reached 89.2 HB and 170.1 MPa, respectively. Compared with the unmodified Al-19Si alloy, the properties were increased by 23.7% and 47.3%, respectively. After solution treatment at 520 ℃ for 8 h and aging at 180 ℃ for 8 h, the Si in the modified alloy was obviously spheroidized, the hardness of the alloy reached up to 91.2 HB, and the tensile strength reached up to 183.6 MPa.


Key words: modification; hypereutectic Al-Si alloy; microstructure; mechanical property

收稿日期: 2024-08-17

基金项目: 国网浙江省电力有限公司科技项目(2019-HUZJTKJ-05).

作者简介: 严建强(1972—), 男, 高级工程师.     * 通信联系人.


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