高诗情,万元元,王艳彬,等.挤压态Mg-Li-Al-Y-Zr-Gd-Nd合金组织及热变形行为研究[J].精密成形工程,2025,17(1):68-79.
GAO Shiqing,WAN Yuanyuan,WANG Yanbin,et al.Microstructure and Hot Deformation Behavior of Extruded Mg-Li-Al-Y-Zr-Gd-Nd Alloy[J].Journal of Netshape Forming Engineering,2025,17(1):68-79. |
| 挤压态Mg-Li-Al-Y-Zr-Gd-Nd合金组织及热变形行为研究 |
| Microstructure and Hot Deformation Behavior of Extruded Mg-Li-Al-Y-Zr-Gd-Nd Alloy |
| 投稿时间：2024-05-21 |
| DOI：10.3969/j.issn.1674-6457.2025.01.009 |
| 中文关键词: 镁锂合金 热压缩 显微组织 本构方程 加工图 |
| 英文关键词: magnesium-lithium alloy hot compression microstructure constitutive equation processing map |
| 基金项目:重庆市杰出青年科学基金(ctsc2021jcyj-jqX0008) |
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| 中文摘要: |
| 目的 对挤压态Mg-Li-Al-Y-Zr-Gd-Nd合金显微组织进行表征，通过镁锂合金单向热压缩实验，研究挤压态Mg-Li-Al-Y-Zr-Gd-Nd合金的热变形行为，建立合金的本构方程及加工图。方法 采用SEM和EBSD等分析测试手段对挤压态合金进行显微组织观察和分析;在Gleeble-3500热模拟实验机上开展单轴热压缩实验，实验条件如下:应变速率为0.001~1 s−1，压缩变形实验温度为200~350 ℃。基于动态材料模型将功率耗散图和失稳图叠加获得热加工图，分析挤压态合金的加工性能随变形温度、速率、应变的变化规律。结果 挤压态Mg-Li-Al-Y-Zr-Gd-Nd合金的主要相为β相，有少量细小的α相均匀分布在β相中。在不同变形条件下，该合金的流变曲线呈现出较为明显的动态再结晶特征，变形温度越低、应变速率越大，峰值应力越大;激活能为98 kJ/mol，应力指数n的值为3.339 0。分析热加工图可知，挤压态Mg-Li-Al-Y-Zr-Gd-Nd合金的成形性能随着应变的增加而增强，当应变为0.1和0.3时，加工图均存在一个失稳区域，这与合金变形不彻底有关;当应变为0.5、0.7、0.9时，不存在失稳区域，合金表现出优异的成形性能。结论 综合考虑挤压态Mg-Li-Al-Y-Zr-Gd-Nd合金实际加工条件，其合理加工区间为变形温度250~350 ℃，应变速率0.01~1 s−1。 |
| 英文摘要: |
| The work aims to characterize the microstructure of the extruded Mg-Li-Al-Y-Zr-Gd-Nd alloy, conduct unidirectional hot compression experiments of magnesia-lithium alloy, study the thermal deformation behavior of the extruded Mg-Li-Al-Y-Zr-Gd-Nd alloy and establish a constitutive equation and machining diagram of the alloy. The microstructure of the extruded alloy was observed and analyzed by analytical testing methods such as SEM and EBSD. A single axis thermal compression experiment was carried out on the Gleeble-3500 thermal simulation experimental machine under conditions of strain rates from 0.001 to 1 s−1 and deformation temperature from 200 to 350 ℃. Based on the dynamic material model, the power dissipation diagram and the instability diagram were superposed to obtain the thermal processing map, and the processing properties of the extruded alloy were analyzed as a function of deformation temperature, rate and strain. The results indicated that the main phase in the extruded Mg-Li-Al-Y-Zr-Gd-Nd alloy was the β phase, with a small amount of fine α phase uniformly distributed within the β phase. The true stress-strain curves of the extruded Mg-Li-Al-Y-Zr-Gd-Nd alloy under different deformation conditions all exhibited characteristics of dynamic recrystallization. As the deformation temperature decreased and the strain rate increased, the peak stress increased. The activation energy (Q) was 98 kJ/mol, and the stress exponent n had a value of 3.339 0. Through analysis with the thermal processing map, the formability of the extruded Mg-Li-Al-Y-Zr-Gd-Nd alloy increased with increasing strain. At strains of 0.1 and 0.3, there was an instability region in the processing map, which was related to incomplete deformation of the alloy. At strains of 0.5, 0.7, and 0.9, there was no instability region, and the alloy exhibited excellent formability. Considering the actual processing conditions of the extruded Mg-Li-Al-Y-Zr-Gd-Nd alloy, the optimal processing window for the alloy is a deformation temperature range of 250 to 350 ℃ and a strain rate range of 0.01 to 1 s−1. |
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