<strong>Bi</strong>对<strong>Mg-3Al-3Nd</strong>合金显微组织和力学性能的影响

doi:10.11901/1005.3093.2019.599

材料研究学报

2020, Vol. 34

Issue (6): 425-433 DOI: 10.11901/1005.3093.2019.599

研究论文

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Bi对Mg-3Al-3Nd合金显微组织和力学性能的影响

陈亮, 王丽萍, 冯义成(

), 王雷, 赵思聪

哈尔滨理工大学材料科学与工程学院哈尔滨 150040

Effect of Bi on Microstructure and Mechanical Properties of Mg-3Al-3Nd Alloy

CHEN Liang, WANG Liping, FENG Yicheng(

), WANG Lei, ZHAO Sicong

School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China

引用本文:

陈亮, 王丽萍, 冯义成, 王雷, 赵思聪. Bi对Mg-3Al-3Nd合金显微组织和力学性能的影响[J]. 材料研究学报, 2020, 34(6): 425-433.
Liang CHEN, Liping WANG, Yicheng FENG, Lei WANG, Sicong ZHAO. Effect of Bi on Microstructure and Mechanical Properties of Mg-3Al-3Nd Alloy[J]. Chinese Journal of Materials Research, 2020, 34(6): 425-433.

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摘要:

使用扫描电子显微镜(SEM)和光学显微镜(OM)观察、X-射线衍射(XRD)分析以及力学性能测试等手段研究了Bi含量对Mg-3Al-3Nd合金的显微组织和力学性能的影响。结果表明：添加Bi元素可细化Mg-3Al-3Nd合金的组织。当Bi含量(质量分数)为1%时晶粒最小，晶粒尺寸从1854±58 μm减小到890±64 μm；Mg-3Al-3Nd合金由呈网状分布在晶界的Al₁₁Nd₃相和分布在晶内的颗粒状Al₂Nd组成；随着Bi含量的提高Al₁₁Nd₃相和Al₂Nd相的数量减少，晶内的BiNd相数量增加；Bi能明显改善Mg-3Al-3Nd合金室温和高温力学性能，Bi含量为1%时其室温和高温力学性能最佳。室温抗拉强度和延伸率分别为167±2.3 MPa和(16.1±0.3)%，高温抗拉强度及延伸率分别为136±1.7 MPa和(19.3±0.3)%。

关键词 ：金属材料, 镁合金, Bi, 显微组织, 力学性能

Abstract：

The effect of Bi on the microstructure and mechanical properties of Mg-3Al-3Nd alloy was investigated by scanning electron microscope (SEM), optical microscope (OM), X-ray diffraction (XRD) and tensile test. The results show that the addition of Bi can refine the microstructure of Mg-3Al-3Nd alloy. When the content (mass fraction) of Bi is 1% the grain size of Mg-3Al-3Nd alloy is the smallest, whilst the grain size reduced from 1854±58 μm for the plain Mg-3Al-3Nd alloy to 890±64 μm for the alloy with 1% Bi addition. The Mg-3Al-3Nd alloy is mainly composed of Al₁₁Nd₃ phase distributed at grain boundaries and granular Al₂Nd distributed within grains. With the increasing Bi content, the volume fraction of Al₁₁Nd₃ phase and Al₂Nd phase decrease, and the volume fraction of BiNd phase distributed within grains increases. The mechanical properties of Mg-3Al-3Nd alloy at room temperature and high temperature are significantly improved with addition of Bi. The ultimate tensile strength and elongation at break of Mg-3Al-3Nd alloy with 1% Bi addition at room temperature and high temperature is 167±2.3 MPa and 16.1±0.3%, 136±1.7 MPa and 19.3±0.3%, respectively.

Key words： metallic materials magnesium alloy Bi microstructure mechanical property

收稿日期: 2019-12-24

ZTFLH:

TG113.12

基金资助:国家自然科学基金(51804090);黑龙江省科学基金(E2018045)

作者简介: 陈亮，男，1995年生，硕士生

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表1 实验合金的名义成分

图1 拉伸试样的尺寸

图2 Mg-3Al-3Nd-xBi合金的低倍光学显微组织

图3 Mg-3Al-3Nd-xBi合金的晶粒尺寸

图4 Mg-3Al-3Nd-xBi合金的XRD衍射图谱

图5 Mg-3Al-3Nd-xBi合金的光学显微组织

图 6 Mg-3Al-3Nd-xBi合金的SEM形貌

表2 图6中各点EDS分析结果(原子分数，%)

表3 Mg-Al-Nd-Bi合金中各相生成焓 (kJ/mol)

图7 Mg-3Al-3Nd-xBi合金的室温拉伸性能

图8 Mg-3Al-3Nd-xBi合金的高温拉伸性能

图 9 Mg-3Al-3Nd-xBi合金室的室温拉伸断口形貌

图 10 Mg-3Al-3Nd-xBi合金的高温拉伸断口形貌

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