吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (10): 2792-2798.doi: 10.13229/j.cnki.jdxbgxb.20221562

• 材料科学与工程 • 上一篇    

Gd对挤压镁合金AZ91组织和氢脆的影响

宋雨来1,2(),李伟光1,2,张林阳3,宋庆军3,张华3,李军3,刘庆1,2   

  1. 1.吉林大学 汽车材料教育部重点实验室，长春 130022
    2.吉林大学 材料科学与工程学院，长春 130022
    3.中国一汽研发总院 材料与轻量化开发院金属材料开发部，长春 130011
  • 收稿日期:2022-11-10 出版日期:2024-10-01 发布日期:2024-11-22
  • 作者简介:宋雨来（1974-），男，教授，博士.研究方向：金属的腐蚀与防护. E-mail： ylsong@jlu.edu.cn
  • 基金资助:
    吉林省重大科技项目(20210301025GX)

Effect of Gd on microstructure and hydrogen embrittlement of AZ91‐extruded magnesium alloy

Yu-lai SONG1,2(),Wei-guang LI1,2,Lin-yang ZHANG3,Qing-jun SONG3,Hua ZHANG3,Jun LI3,Qing LIU1,2   

  1. 1.Key Laboratory of Automobile Materials，Ministry of Education，Jilin University，Changchun 130022，China
    2.College of Materials Science and Engineering，Jilin University，Changchun 130022，China
    3.Metal Materials Department of Materials & lightweight Institute，General R&D Institute，China FAW Co. ，Ltd. ，Changchun 130011，China
  • Received:2022-11-10 Online:2024-10-01 Published:2024-11-22

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摘要：

采用挤压法制备了AZ91和AZ91-xGd（x=0.5、1.0、1.5）镁合金。采用扫描电镜、电化学氧化法、慢应变速率拉伸法，研究了挤压镁合金AZ91和AZ91-xGd的微观组织、充氢及氢脆行为。结果表明：随着Gd的加入，AZ91中的β-Mg17Al12尺寸减小，数量减少，分布均匀。在相同的充氢条件下，随着稀土Gd含量的增加，挤压镁合金AZ91中的氢浓度逐渐降低，在一定程度上解决了氢在合金中的偏聚问题，使氢脆敏感性大大降低，有效提升了抗氢脆性能。

关键词: 材料加工工程, 镁合金, 钆, 氢脆

Abstract:

AZ91 and Az91-xGd（x=0.5，1.0，1.5）magnesium alloys were prepared by extrusion method. The microstructures， hydrogen charging and hydrogen embrittlement behavior of AZ91 and Az91-xGd alloys were studied by scanning electron microscopy， electrochemical oxidation and slow strain rate tensile methods. The results show that with the addition of Gd， the size and quantity of β-Mg17Al12 in AZ91 decrease， and the distribution is uniform. Under the same hydrogen-charged conditions， with the increase of rare earth Gd content， the hydrogen concentration in extruded magnesium alloy AZ91 gradually decreases， which solves the problem of partial polymerization of hydrogen in the alloy to a certain extent， greatly reduces the hydrogen embrittlement susceptibility， and effectively improves the hydrogen embrittlement resistance.

Key words: materials processing engineering, magnesium alloy, Gd, hydrogen embrittlement

中图分类号: 

  • TG146.22

表1

AZ91与Gd改性挤压AZ91成分（质量分数）"

合 金AlZnMnGdFeMg
AZ918.570.620.28-0.0009Bal.
AZ91-0.5Gd8.550.610.260.480.0006Bal.
AZ91-1.0Gd8.560.590.241.020.0003Bal.
AZ91-1.5Gd8.540.600.241.510.0003Bal.

图1

应力腐蚀开裂拉伸试样尺寸"

图2

挤压镁合金AZ91和AZ91-xGd的XRD图谱"

图3

挤压镁合金的SEM显微照片"

图4

挤压镁合金AZ91和AZ91-xGd在同一充氢电流密度下的氢溢出电流密度随时间的变化"

表2

挤压镁合金AZ91和AZ91-xGd的氢浓度"

合金充氢电流密度/ （mA·cm-2）氢浓度/ （10-6mol·cm-3）
AZ9100.04
703.86
AZ91-0.5Gd00.04
700.78
AZ91-1.0Gd00.03
700.54
AZ91-1.5Gd00.03
700.41

图5

挤压镁合金AZ91和AZ91-xGd在同一充氢电流密度下的力学性能"

图6

挤压镁合金AZ91和AZ91-xGd在同一充氢电流密度下的氢脆敏感性"

图7

挤压镁合金AZ91和AZ91-1.0Gd在70 mA/cm2充氢电流密度下的断口形貌"

图8

挤压镁合金AZ91和AZ91-1.0Gd在充氢电流密度70 mA/cm2下的侧表面形貌"

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