不同细化剂对AM50镁合金晶粒大小的影响及机理

程仁菊; 蒋林希; 王海军; 吴夏; 王娟; 钟昱凡; 谭力

doi:10.3969/j.issn.1674-6457.2026.01.006

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精密成形工程 ›› 2026, Vol. 18 ›› Issue (1) : 57-63. DOI: 10.3969/j.issn.1674-6457.2026.01.006

轻合金成形

不同细化剂对AM50镁合金晶粒大小的影响及机理

程仁菊¹, 蒋林希¹, 王海军¹, 吴夏², 王娟³, 钟昱凡¹, 谭力^1,*

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Effect and Mechanism of Different Densifiers on Grain Size of AM50 Magnesium Alloy

CHENG Renju¹, JIANG Linxi¹, WANG Haijun¹, WU Xia², WANG Juan³, ZHONG Yufan¹, TAN Li^1,*

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摘要

目的研究不同细化剂对AM50镁合金晶粒大小的影响机理,分析不同元素与镁基体晶格匹配关系,进而讨论不同细化剂对合金晶粒细化的影响机理,为镁合金晶粒细化剂的选择提供有效参考。方法向AM50镁合金中添加不同的细化剂（Al₅Ti_0.5C、Al₅TiB、MgCO₃）,通过OM、XRD、SEM和EDS分析其组织并统计晶粒大小,并通过边-边匹配模型（E2EM）计算不同细化剂中形核颗粒相（Al₄C₃、Al₂CO、TiC和TiB₂）与α-Mg的晶格错配度和原子错配度,从而分析晶粒细化机理。结果添加Al₅Ti_0.5C、Al₅TiB、MgCO₃ 3种细化剂后,合金的相组成没有发生改变,但均得到了良好的晶粒细化效果,与未经过细化剂处理的AM50镁合金相比,晶粒细化率分别达到87%、85%和80%。其中,经Al₅Ti_0.5C处理的AM50合金平均晶粒尺寸由原先的163 μm降至21 μm。结论 Al₅Ti_0.5C、Al₅TiB、MgCO₃ 3种细化剂对AM50合金均有较好的晶粒细化效果,根据E2EM模型,Al₄C₃、Al₂CO、TiC和TiB₂颗粒在晶格匹配方面均与α-Mg保持近乎共格的界面关系,其中Al₂CO和Mg原子错配度最小;Al₅Ti_0.5C细化剂在变质处理过程中,一方面可以提供TiC颗粒作为形核核心,另一方面可以形成Al₄C₃或Al₂CO作为形核核心,具有最佳的晶粒细化效果。

Abstract

The work aims to investigate the effects and mechanisms of different refiners on the grain size of AM50 magnesium alloy, analyze the lattice matching relationship between various elements and the magnesium matrix, further discuss the grain refinement mechanisms of different refiners, and provide effective references for the selection of grain refiners for magnesium alloy. Different modifiers (Al₅Ti_0.5C, Al₅TiB and MgCO₃) were added to AM50 magnesium alloy. The microstructure was analyzed and the grain size was statistically measured by Optical Microscopy (OM), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS). Additionally, an Edge-to-Edge Matching (E2EM) model was employed to calculate the lattice mismatch and atomic mismatch between the nucleating particle phases (Al₄C₃, Al₂CO, TiC and TiB₂) in different refiners and α-Mg, so as to analyze the grain refining mechanism. After adding the three refiners of Al₅Ti_0.5C, Al₅TiB and MgCO₃, the phase composition of the alloy remained unchanged, but all achieved excellent grain refinement effects. Compared with the AM50 magnesium alloy without refiner treatment, the grain refinement rates reached 87%, 85%, and 80% respectively. Among them, the average grain size of AM50 alloy treated with Al₅Ti_0.5C decreased from the original 163 μm to 21 μm. In conclusion, all three kinds of refiners (Al₅Ti_0.5C, Al₅TiB, and MgCO₃) have good grain refining effects on AM50 alloy, and according to the E2EM model, the Al₄C₃, Al₂CO, TiC and TiB₂ particles are all nearly coherent interface relationship with α-Mg in terms of lattice matching, where Al₂CO and Mg atom mismatch is the smallest, the alloy with Al₅Ti_0.5C refiner can provide TiC particles as nucleation core on one hand, and form Al₄C₃ or Al₂CO as nucleation core on the other hand during the densification process, thus demonstrating the optimal grain refinement effect.

导出引用

程仁菊, 蒋林希, 王海军, 吴夏, 王娟, 钟昱凡, 谭力. 不同细化剂对AM50镁合金晶粒大小的影响及机理[J]. 精密成形工程. 2026, 18(1): 57-63 https://doi.org/10.3969/j.issn.1674-6457.2026.01.006

CHENG Renju, JIANG Linxi, WANG Haijun, WU Xia, WANG Juan, ZHONG Yufan, TAN Li. Effect and Mechanism of Different Densifiers on Grain Size of AM50 Magnesium Alloy[J]. Journal of Netshape Forming Engineering. 2026, 18(1): 57-63 https://doi.org/10.3969/j.issn.1674-6457.2026.01.006

中图分类号： TG146.22

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