<strong>Mn</strong>对<strong>Mg-Y-Cu</strong>合金的组织和性能的影响

doi:10.11901/1005.3093.2021.633

材料研究学报

2023, Vol. 37

Issue (5): 362-370 DOI: 10.11901/1005.3093.2021.633

研究论文

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Mn对Mg-Y-Cu合金的组织和性能的影响

张帅杰, 吴谦, 陈志堂, 郑滨松, 张磊(

), 徐翩

南昌航空大学航空制造工程学院南昌 330063

Effect of Mn on Microstructure and Properties of Mg-Y-Cu Alloy

ZHANG Shuaijie, WU Qian, CHEN Zhitang, ZHENG Binsong, ZHANG Lei(

), XU Pian

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

引用本文:

张帅杰, 吴谦, 陈志堂, 郑滨松, 张磊, 徐翩. Mn对Mg-Y-Cu合金的组织和性能的影响[J]. 材料研究学报, 2023, 37(5): 362-370.
Shuaijie ZHANG, Qian WU, Zhitang CHEN, Binsong ZHENG, Lei ZHANG, Pian XU. Effect of Mn on Microstructure and Properties of Mg-Y-Cu Alloy[J]. Chinese Journal of Materials Research, 2023, 37(5): 362-370.

全文: PDF(20814 KB) HTML

摘要:

研究了Mn对Mg_95.5Y₃Cu_1.5合金的组织、拉伸性能和腐蚀行为的影响。结果表明，随着Mn含量的提高合金中的初生α-Mg相细化，其形貌由树枝晶转变为等轴枝晶状，而LPSO相的形貌和体积分数未发生明显的变化；合金的屈服强度、极限拉伸强度和伸长率都提高，与未添加Mn的合金相比Mn含量为0.9%(原子分数)的合金分别提高了20.7%、17.6%和41.0%。合金试样在1%(质量分数)NaCl溶液中的析氢速率、质量损失速率和腐蚀电流密度都降低，腐蚀电位向正向移动，表明其耐腐蚀性能提高。

关键词 ：金属材料, Mg-Y-Cu合金, 组织, 拉伸性能, 腐蚀行为, Mn含量

Abstract：

The effect of Mn on the solidification microstructure, tensile properties and corrosion behavior of Mg_95.5Y₃Cu_1.5 alloy was investigated. The results show that with the increase of Mn content, the primary α-Mg phase in the alloy is gradually refined, and it also changes from dendritic to equiaxed dendritic morphology, while the morphology and volume fraction of LPSO phase do not change significantly. The addition of Mn improves the tensile properties of the alloy. When the Mn content is 0.9% (atom fraction) the yield strength, ultimate tensile strength and elongation are increased by 20.7%, 17.6% and 41.0% respectively compared with the alloy without Mn addition. In addition, the corrosion performance of the alloy is also improved. With the increase of Mn content, the volume of hydrogen evolution rate, mass loss rate and corrosion current density of the alloys gradually decrease, and the corrosion potential of the alloys, meanwhile, gradually moves towards positive direction.

Key words： metallic materials Mg-Y-Cu alloy microstructure tensile property corrosion behavior Mn content

收稿日期: 2021-11-12

ZTFLH:

TG146.2+2

基金资助:国家自然科学基金(51401102)

作者简介: 张帅杰，男，1995年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.633 或 https://www.cjmr.org/CN/Y2023/V37/I5/362

表1 实验用合金的成分

图1 铸态Mg95.5-x Y3Cu1.5Mn x 合金的XRD谱

图2 Mg94.6Y3Cu1.5Mn0.9合金显微组织的BSE像和EDS面扫描图

表2 图2中各微区EDS分析结果

图3 铸态Mg94.6Y3Cu1.5Mn0.9合金中LPSO相的TEM明场像、HRTEM相和选区电子衍射花样

图4 铸态Mg95.5-x Y3Cu1.5Mn x 合金显微组织的OM像

表3 实验合金晶粒尺寸和LPSO相体积分数的统计结果

图5 铸态Mg95.5-x Y3Cu1.5Mn x 合金显微组织的BSE像

图6 铸态Mg95.5-x Y3Cu1.5Mn x 合金的室温拉伸应力-应变曲线

表4 合金室的温拉伸性能

图7 合金的室温拉伸断口形貌

图8 铸态Mg95.5-x Y3Cu1.5Mn x 合金的析氢曲线

图9 铸态Mg95.5-x Y3Cu1.5Mn x 合金的质量损失速率

图10 合金的腐蚀表面形貌

表5 图10中各微区EDS分析结果

图11 铸态Mg95.5-x Y3Cu1.5Mn x 合金在1%NaCl溶液中的动电位极化曲线

表6 图11中极化曲线的拟合结果

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