| 引用本文： |
-
庞兴志,杨剑冰,湛永钟,许世文,陆茂森,陈远攀.稀土Ho对Al-Zn-Mg-Cu系高强铝合金显微组织和力学性能的影响[J].广西科学,2015,22(5):521-526. [点击复制]
- PANG Xing-zhi,YANG Jian-bing,ZHAN Yong-zhong,XU Shi-wen,LU Mao-sen,CHEN Yuan-pan.Effects of Ho on Microstructure and Mechanical Properties of Al-Zn-Mg-Cu High Strength Aluminum Alloy[J].Guangxi Sciences,2015,22(5):521-526. [点击复制]
|
|
| 摘要: |
| [目的]为了提高Al-Zn-Mg-Cu系高强铝合金的综合性能,研究了稀土钬(Ho)对Al-Zn-Mg-Cu系高强铝合金显微组织及力学性能的影响。[方法]采用金相显微镜、扫描电镜观察、能谱仪和拉伸试验等方法对稀土钬(Ho)改性Al-Zn-Mg-Cu系高强铝合金显微组织和力学性能进行了研究。[结果]加入Ho能够细化基体组织、净化晶界,使呈网状连续分布的晶界变为断续的岛状和鱼骨状;当稀土Ho的含量为0.5%时,晶粒达到最小最细状态,且合金熔铸缺陷明显减少,合金的抗拉强度为244 MPa,伸长率为2.92%,韧性达到最大值;随着Ho含量的增加,合金中生成了一种新相Al3Ho,该相较软,析出在晶界,从而降低了合金的硬度。[结论]加入适量稀土元素Ho可以有效细化Al-Zn-Mg-Cu系高强铝合金的组织,显著提高合金的塑性及韧性,但硬度下降。 |
| 关键词: Al-Zn-Mg-Cu系高强铝合金 钬 显微组织 力学性能 |
| DOI： |
| 投稿时间：2015-07-11修订日期：2015-09-13 |
| 基金项目:广西科学研究与技术开发计划项目(桂科重12118001-2B和桂科重1348001-9),2013年广西大学大学生实验技能和科技创新能力训练基金项目(SYJN20133111)和广西大学有色金属及加工新技术教育部重点实验室开放基金项目(GXKFJ09-08)资助。 |
|
| Effects of Ho on Microstructure and Mechanical Properties of Al-Zn-Mg-Cu High Strength Aluminum Alloy |
|
PANG Xing-zhi1, YANG Jian-bing2, ZHAN Yong-zhong1, XU Shi-wen1, LU Mao-sen1, CHEN Yuan-pan1
|
| (1.College of Materials Science and Engineering, Guangxi University, Nanning, Guangxi, 530004, China;2.Xingjian College of Science and Liberal Arts, Guangxi University, Nanning, Guangxi, 530004, China) |
| Abstract: |
| [Objective] In order to improve the comprehensive of Al-Zn-Mg-Cu high strength aluminum alloy, the effects of holmium (Ho) on the microstructure and mechanical properties of high strength aluminum alloy were investigated.[Methods] Metallographic microscope, scanning electron microscopy(SEM), energy dispersivespectroscopy(EDS)and various testing machines were used to analyze Ho effects on the microstructures and mechanical properties of Al-Zn-Mg-Cu high strength aluminum alloy.[Results] The addition of Ho not only refines matrix organization but also purifies grain boundary, changing the net-like continuous distribution of grain boundary to intermittent island and herringbone.When the Ho is added to 0.5%, fine grain reaches to the minimized state, which significantly reduces the alloy casting defects, resulting in the maximum of tensile strength (244 MPa), elongation percentage (2.92%) and toughness in Al-Zn-Mg-Cu-Ho high strength aluminum alloy.The hardness of alloy reduces with the increase in the addition of Ho, because a new soft phase Al3Ho is generated.[Conclusion] Appropriate addition of Ho can effectively increase the tensile strength and ductility of Al-Zn-Mg-Cu-Ho high strength aluminum alloy due to the fine-grained strength, but high Ho content can decrease the hardness. |
| Key words: Al-Zn-Mg-Cu high strength aluminum alloy holmium microstructure mechanical properties |
