|
| Zr含量对Mg–4Zn–xZr合金显微组织及阻尼性能的影响 |
| Effect of Zr Content on Microstructure and Damping Properties of As-cast Mg-4Zn-xZr Alloy |
| |
| DOI：10.3969/j.issn.1674-6457.2023.02.006 |
| 中文关键词: Zr 显微组织 阻尼性能 力学性能 Mg–4Zn–xZr |
| 英文关键词: Zr microstructure damping properties mechanical properties Mg-4Zn-xZr |
| 基金项目:广西高等学校高水平创新团队项目(桂教师范〔2019〕52号);柳州市科技计划(2021CBA0102);广西研究生教育创新计划(YCSW2021323) |
| Author Name | Affiliation | | ZHU Jia-xin | School of Mechanical and Automotive Engineering,Guangxi Liuzhou 545006, China
Guangxi Earthmoving Machinery Collaborative Innovation Center,Guangxi Liuzhou 545006, China | | SUN You-ping | School of Mechanical and Automotive Engineering,Guangxi Liuzhou 545006, China
Guangxi Earthmoving Machinery Collaborative Innovation Center,Guangxi Liuzhou 545006, China
Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Guangxi Liuzhou 545006, China | | HE Jiang-mei | School of Mechanical and Automotive Engineering,Guangxi Liuzhou 545006, China
Guangxi Earthmoving Machinery Collaborative Innovation Center,Guangxi Liuzhou 545006, China
Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Guangxi Liuzhou 545006, China | | XIE Shang-heng | School of Mechanical and Automotive Engineering,Guangxi Liuzhou 545006, China
Guangxi Earthmoving Machinery Collaborative Innovation Center,Guangxi Liuzhou 545006, China | | FANG De-jun | School of Mechanical and Automotive Engineering,Guangxi Liuzhou 545006, China
Guangxi Earthmoving Machinery Collaborative Innovation Center,Guangxi Liuzhou 545006, China |
|
| Hits: 1677 |
| Download times: 852 |
| 中文摘要: |
| 目的 为探究Zr含量变化对铸态Mg–4Zn–xZr(x=0.3，0.6，0.9，x表示质量分数，%)合金显微组织、力学性能和阻尼性能的影响。方法 通过扫描电镜(SEM)分析其显微组织变化，动态热分析仪(DMA)探究其高温及常温阻尼性能，X射线衍射仪(XRD)分析其物相，电子万能试验机进行力学性能测试。结果 Zr的质量分数由0.3%增至0.9%时，Mg–4Zn–xZr合金的平均晶粒尺寸分别为121、108、83 µm，第二相分别为岛屿状的MgZn、长条状的MgZn2和细小颗粒状的Mg7Zn3。在低温区，3种合金均存在阻尼峰P1，临界应变振幅点ε0.1的阻尼值Q–1分别为0.061、0.044和0.023;在高温区，存在阻尼峰P2。随着Zr含量的增加，Mg–4Zn–xZr合金的抗拉强度由182 MPa提升至207 MPa，伸长率由15%下降至10.1%。结论 随着Zr含量的增加，合金中产生新的形核中心，晶粒发生细化，晶粒低位错储存能力提高，抗拉强度上升，塑性和阻尼性能下降。低温区P1峰为晶界阻尼峰，具有热激活弛豫特征;高温区P2峰为晶界型阻尼峰和微塑性型阻尼峰的叠加。 |
| 英文摘要: |
| The work aimsto explore the effect of different Zr contents on the microstructure, mechanical properties and damping properties of the as-cast Mg-4Zn-xZr (x=0.3, 0.6, 0.9, wt.%) alloy. For the alloy, the microstructure changes were analyzed by scanning electron microscopy (SEM), the damping properties at high temperature and normal temperature were explored by dynamic mechanical thermal analyzer (DMA), the material phases were analyzed by X-ray diffractor (XRD) and the mechanical properties were tested by electronic universal testing machine. When the Zr content increased from 0.3wt.% to 0.9wt.%, the average grain size of Mg-4Zn-xZr alloy was 121, 108 and 83 µm, respectively and the second phase was island MgZn, long strip MgZn2 and fine granular Mg7Zn3, respectively. In the low temperature region, all the three alloys had a damping peak P1, and the damping value Q–1of ε0.1 was 0.061, 0.044 and 0.023, respectively. In the high temperature region, there was a damping peak of P2. With the increase of the Zr content, the tensile strength of the Mg-4Zn-xZr alloy increased from 182 MPa to 207 MPa, and the elongation decreased from 15% to 10.1%. With the increase of the Zr content, new shaped core center occurs in the alloy, the grains get refined, the low mis-storage capacity of the grains becomes higher, the tensile strength increases and the shaping and damping properties decrease. In the low temperature region, the damping peak P1 is a grain boundary damping peak, which is characterized by thermally activated relaxation. In the high temperature region, the damping peak P2 is the superposition of the grain boundary damping peak and the microplastic damping peak. |
|
View Full Text
View/Add Comment Download reader |
| Close |
|
|
|
渝公网安备 50010702501719号