电磁搅拌对Sr变质体育器材用铝基复合材料的影响

doi:10.13251/j.issn.0254-6051.2023.07.038

摘要/Abstract

摘要： 以Al-K₂TiF₆为反应体系,体育器材用ADC12铝合金为基体,通过电磁搅拌技术制备了Sr变质Al₃Ti/ADC12铝基复合材料,研究了制备工艺和工艺参数对铝基复合材料的微观组织和力学性能的影响。结果表明,电磁搅拌和Sr变质处理均对Al₃Ti/ADC12铝基复合材料微观组织起到了细化作用,α-Al细化为球状晶,Al₃Ti尺寸减小到10 μm,团聚现象得到改善,鱼骨状AlFeMnSi相消失,共晶Si由长针状细化为短棒状。随着搅拌电流的增大,α-Al尺寸减小,形貌越圆整。当搅拌电流为35 A时,α-Al尺寸最小,形貌最圆整,孔隙率最小,抗拉强度和伸长率最大,相比于ADC12铝合金基体分别提升了24.1%和22.1%。电磁搅拌和Sr变质对铝基复合材料起到了弥散强化和细晶强化的作用。

关键词: 体育器材, 铝基复合材料, 电磁搅拌, 微观组织, 力学性能

Abstract: Sr modified Al₃Ti/ADC12 aluminum matrix composites were prepared by electromagnetic stirring with Al-K₂TiF₆ as reaction system and ADC12 aluminum alloy as matrix for sports equipment. The effects of preparation process and process parameters on microstructure and mechanical properties of aluminum matrix composites were studied. The results show that both electromagnetic stirring and Sr modification can refine the microstructure of the Al₃Ti/ADC12 aluminum matrix composites. The α-Al phase is refined to globular crystal, and the size of Al₃Ti is reduced to 10 μm, the agglomeration phenomenon of Al₃Ti is improved. The fishbone-like AlFeMnSi phase disappears, and the eutectic Si is refined from long needle to short rod. As the stirring current increases, the size of α-Al phase is smaller, and the morphology is rounder. When the stirring current is 35 A, the size of α-Al phase is the smallest, the morphology is the roundest, the porosity is the smallest, and the tensile strength and elongation are the largest, which are increased by 24.1% and 22.1%, respectively, compared with ADC12 aluminum alloy matrix. Electromagnetic stirring and Sr modification play a role in dispersion strengthening and fine grain strengthening of aluminum matrix composites.

Key words: sports equipment, aluminum matrix composites, electromagnetic stirring, microstructure, mechanical properties

中图分类号:

TG146.2

姬旺勤, 王晓兵, 周亚坤, 赵银. 电磁搅拌对Sr变质体育器材用铝基复合材料的影响[J]. 金属热处理, 2023, 48(7): 217-222.

Ji Wangqin, Wang Xiaobing, Zhou Yakun, Zhao Yin. Effect of electromagnetic stirring on Sr modified aluminum matrix composites for sports equipment[J]. Heat Treatment of Metals, 2023, 48(7): 217-222.

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