| 程正翠.Y含量对汽车变速箱AK30镁合金显微组织及力学性能的影响[J].井冈山大学自然版,2019,40(5):72-76 |
| Y含量对汽车变速箱AK30镁合金显微组织及力学性能的影响 |
| EFFECT OF Y CONTENT ON SOLIDIFICATION MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AUTOMOBILE GEARBOX AK30 MAGNESIUM ALLOY |
| 投稿时间：2019-02-19 修订日期：2019-03-21 |
| DOI：10.3969/j.issn.1674-8085.2019.05.014 |
| 中文关键词: AK30镁合金 Y含量 凝固组织 力学性能 |
| 英文关键词: AK30 magnesium alloy Y content solidification microstructure mechanical properties |
| 基金项目:安徽省自然科学研究项目（2018zk01） |
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| 中文摘要: |
| 采用光学显微镜（OM）、扫描电镜（SEM）、X射线衍射（XRD）、维氏硬度和拉伸-压缩试验机等手段，评价Y含量对AK30镁合金微观组织和力学性能的影响。研究结果发现，Y含量能够显著影响AK30镁合金凝固组织和力学性能。当合金中没有添加Y元素时，AK30镁合金的晶粒粗大，晶界处有大量的Mg3Zn相分布，力学性能最差。当合金中添加1%的Y元素时，AK30镁合金的晶粒尺寸没有发生变化，依然较大；但晶界处的Mg3Zn相却在减少，而合金的晶内却出现了少量的Mg3Y相，合金的力学性能增加。当合金中的Y含量增加到2%时，晶粒细化，晶体内析出了大量的Mg3Zn相与α-Mg相组成的共晶组织，力学性能达到最大值。当合金的Y含量增加到4%时，晶粒粗化，且大量的Mg3Zn脆性相在晶界处析出，合金的力学性能下降。为了提高AK30镁合金的力学性能，应该向AK30镁合金中添加2%的Y元素。 |
| 英文摘要: |
| In this paper, the effect of Y content on the solidification microstructureand the mechanical properties of AK30 alloy was preliminarily investigated by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD), Vickers hardness, and tensile-compressive testing machine. Y content could effect on solidification microstructure and the mechanical properties of AK30 alloy. It was found that the increase of Y content could refine thesolidification microstructure obviously. At w(Y)=0, the morphology of primary phases was coarse and a number of Mg3Zn phase existed ingrain boundary. At w(Y)=1%, size of grain did not change and there were a small number of Mg3Zn phase ingrain boundary. However, there existed a small number of Mg3Y phase ingrain. At w(Y)=2%, size of grain was refined, and there were many eutectic structures ingrain. At w(Y)=4%, the morphology of primary phases was coarse again, and there were many brittle phases ingrain boundary. However, with the increase of Y content, the mechanical properties of AK30 alloy increased at first, then decreased. in order to improve the mechanical properties of AK30 alloy, it should add 2% of Y content to AK30 alloy. |
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