含<strong>LPSO</strong>相<strong>Mg-Y-Er-Ni</strong>合金的组织和拉伸性能

doi:10.11901/1005.3093.2022.347

材料研究学报

2023, Vol. 37

Issue (9): 697-705 DOI: 10.11901/1005.3093.2022.347

研究论文

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含LPSO相Mg-Y-Er-Ni合金的组织和拉伸性能

欧阳康昕, 周达, 杨宇帆, 张磊(

)

南昌航空大学航空制造工程学院南昌 330063

Microstructure and Tensile Properties of Mg-Y-Er-Ni Alloy with Long Period Stacking Ordered Phases

OUYANG Kangxin, ZHOU Da, YANG Yufan, ZHANG Lei(

)

School of Aeronautical Manufacture Engineering, Nanchang Hangkong University, Nanchang 330063, China

引用本文:

欧阳康昕, 周达, 杨宇帆, 张磊. 含LPSO相Mg-Y-Er-Ni合金的组织和拉伸性能[J]. 材料研究学报, 2023, 37(9): 697-705.
Kangxin OUYANG, Da ZHOU, Yufan YANG, Lei ZHANG. Microstructure and Tensile Properties of Mg-Y-Er-Ni Alloy with Long Period Stacking Ordered Phases[J]. Chinese Journal of Materials Research, 2023, 37(9): 697-705.

全文: PDF(15490 KB) HTML

摘要:

用重力铸造法制备3种Mg₉₇Y_2-_x Er _x Ni₁(x=0.5、1、1.5)合金，研究了其铸态和(520℃，12 h)固溶态的组织和拉伸性能。结果表明：3种铸态合金都由α-Mg基体和18R-LPSO相组成，其中Mg₉₇Y₁Er₁Ni₁晶粒最细，LPSO相的体积分数最高、尺寸最小且分布最为均匀，因此其室温拉伸性能最佳。进行(520℃，12 h)固溶处理后，3种固溶态合金仍然由α-Mg基体和18R-LPSO相组成。固溶态Mg₉₇Y_1.5Er_0.5Ni₁合金晶内出现基面层错，但是并不具有完整的堆垛周期性特征。与铸态相比，3种固溶态合金的室温拉伸性能均有所提高。

关键词 ：金属材料, Mg-Y-Er-Ni合金, LPSO相, 组织, 拉伸性能

Abstract：

Mg-alloys Mg97Y1.5Er0.5Ni1, Mg97Y1Er1Ni1 and Mg97Y0.5Er1.5Ni1 were fabricated by gravity casting method. Then the microstructure and tensile properties of the as-cast and solution-treated (520℃, 12 h) alloys were investigated by means of SEM with EDS, TEM and electronic universal testing machine. The results show that the as-cast alloys Mg97Y1.5Er0.5Ni1, Mg97Y1Er1Ni1 and Mg97-Y0.5Er1.5Ni1 are mainly composed of α-Mg matrix and 18R-LPSO phase. The grain size of α-Mg in the as-cast Mg97Y1Er1Ni1 alloy is the smallest and the volume fraction of LPSO phase is the highest among all the three alloys. Moreover, the as-cast Mg97Y1Er1Ni1 alloy presents the finest particles of LPSO phase and they also distribute much uniformly. Therefore, the as-cast Mg97Y1Er1Ni1 alloy shows the best tensile properties. After solid solution treatment at 520℃ for 12 h, the three alloys Mg97Y1.5-Er0.5Ni1, Mg97Y1Er1Ni1 and Mg97Y0.5Er1.5Ni1 all consist mainly of α-Mg matrix and 18R-LPSO phase. Inside the grains of the solution-treated Mg97Y1.5Er0.5Ni1 alloy, it is found that there are some stacking faults, which does not have a complete periodicity. The tensile properties of the three solution-treated alloys are all enhanced compared with those of the as-cast alloys.

Key words： metallic materials Mg-Y-Er-Ni alloy LPSO phase microstructure tensile property

收稿日期: 2022-06-28

ZTFLH:

TG146.2+2

基金资助:国家自然科学基金(51401102)

通讯作者: 张磊，副教授，niatzhanglei01@126.com，研究方向为高强轻合金

Corresponding author: ZHANG Lei，Tel: 13576062172，E-mail: niatzhanglei01@126.com

作者简介: 欧阳康昕，男，1995年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.347 或 https://www.cjmr.org/CN/Y2023/V37/I9/697

表1 实验合金的成分

图1 铸态Mg97Y2-x Er x Ni1合金的XRD谱

图2 铸态Mg97Y2-x Er x Ni1合金微观组织的BSE照片

表2 图2中各微区的EDS分析结果

图3 铸态Mg97Y1Er1Ni1合金中LPSO相的HRTEM形貌和选区电子衍射花样

图4 铸态合金的平均晶粒尺寸、LPSO相平均宽度和LPSO相体积分数

图5 铸态合金的室温拉伸性能

图6 铸态合金室温拉伸断口的形貌

图7 固溶态Mg97Y2-x Er x Ni1合金的XRD谱

图8 固溶态Mg97Y2-x Er x Ni1合金微观组织的BSE照片

表3 图8中各微区的EDS分析结果

图9 固溶态Mg97Y1.5Er0.5Ni1合金中LPSO相的HRTEM形貌和选区电子衍射花样

图10 固溶态Mg97Y1.5Er0.5Ni1合金中基面层错的TEM明场像、HRTEM相和选区电子衍射花样

图11 固溶态合金的平均晶粒尺寸、LPSO相平均宽度和LPSO相的体积分数

图12 固溶态合金的室温拉伸性能

表4 本文制备的Mg97Y1Er1Ni1合金和其他相关合金的室温拉伸性能

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