添加Gd对变形镁合金AZ31组织与力学性能的影响

doi:10.11901/1005.3093.2013.759

材料研究学报

2014, Vol. 28

Issue (8): 579-586 DOI: 10.11901/1005.3093.2013.759

本期目录 | 过刊浏览

添加Gd对变形镁合金AZ31组织与力学性能的影响

李栋,陈雨来,胡水平,蔡庆伍(

)

北京科技大学高效轧制国家工程研究中心北京 100083

Effect of Gd Addtion on Microstructure and Mechanical Properties of Wrought AZ31 Magnesium Alloys

Dong LI,Yulai CHEN,Shuiping HU,Qingwu CAI(

)

National Engineering Research Center of Advanced Rolling; University of Science and Technology Beijing, Beijing 100083

引用本文:

李栋,陈雨来,胡水平,蔡庆伍. 添加Gd对变形镁合金AZ31组织与力学性能的影响[J]. 材料研究学报, 2014, 28(8): 579-586.
Dong LI, Yulai CHEN, Shuiping HU, Qingwu CAI. Effect of Gd Addtion on Microstructure and Mechanical Properties of Wrought AZ31 Magnesium Alloys[J]. Chinese Journal of Materials Research, 2014, 28(8): 579-586.

全文: PDF(12522 KB) HTML

摘要:

研究了在变形镁合金AZ31中添加稀土元素Gd对合金铸态和轧态组织与性能的影响。结果表明: 加入AZ31中的Gd元素形成了稀土相Al₂Gd和Al-Mn-Gd的混合相, 使β-Mg₁₇Al₁₂相的数量减少甚至消失。铸态合金中的少量Gd元素削弱了Al的晶粒细化作用, 使组织粗化; 而当Gd元素的含量提高时Gd开始发挥晶粒细化作用, 使合金的晶粒显著细化。对于轧态合金, 加入Gd元素后形成的Al₂Gd相能促进合金在轧制过程中的动态再结晶, 使孪晶数量减少, 加工硬化作用减弱, 晶粒尺寸细化。而过量的Gd元素形成粗大的第二相, 使合金组织粗化。因此, 适量的Gd元素可使轧态AZ31合金的强度降低而延伸率提高, 其中在350℃轧制的AZ31-0.8Gd合金的延伸率最高(为13.4%), 不含Gd的合金延伸率仅为5.4%。

关键词 ：金属材料, 镁合金, 钆, 轧制, 组织, 力学性能

Abstract：

The effect of Gd addition on the evolution of microstructure and mechanical properties of wrought AZ31 magnesium alloys was investigated. The results show that the added Gd reacts with other elements to form Al₂Gd and Al-Mn-Gd phase, leading to a reduction of β-Mg₁₇Al₁₂; for the as-cast alloy, a small amount of Gd addition weakens the grain refinement effect of Al and coarsens the grain size, then with the increasing amount of Gd addition, the grain size is reduced; for the rolled alloys, Al₂Gd can promote the dynamic recrystallization during the rolling process, which may result in the reducing of the number of twins, the weakening of the role of work hardening and the refining of grain size. However, an excess of Gd addition may induce the coarsening of second phase as well as the microstructure of the alloys. Therefore an appropriate amount of Gd addition can increase the elongation, while reduce the strength of the rolled AZ31 alloys. An optimal elongation 13.4% can be measured for the rolled AZ31-0.8Gd at 350℃, in the contrast, only 5.4% for the AZ31 without Gd addition.

Key words： metallic materials magnesium Gd rolling microstructure mechanical properties

收稿日期: 2013-10-15

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.759 或 https://www.cjmr.org/CN/Y2014/V28/I8/579

表1 实验用合金的化学成分(质量分数, %)

图1 实验合金的X射线衍射图谱

图2 铸态AZ31-1.5Gd合金的扫描电镜照片

图3 不同Gd含量铸态合金的显微组织

图4 不同Gd含量铸态合金的平均晶粒尺寸

图5 250℃轧制态实验合金显微组织

图6 300℃轧制态实验合金显微组织

图7 350℃轧制态实验合金显微组织

图8 400℃轧制态实验合金的显微组织

图9 在不同温度轧制实验合金的抗拉强度

图10 在不同温度轧制实验合金的屈服强度

图11 在不同温度轧制实验合金的延伸率

图12 轧制态实验合金的拉伸断口形貌

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