| 冯静,丁冬雁,张俊超,高勇进,陈国桢,陈为高,尤小华.Ti元素对7072铝合金显微组织与性能的影响[J].有色金属材料与工程,2013,34(1):. |
| Ti元素对7072铝合金显微组织与性能的影响 |
| The Effects of Titanium Addition on Microstructure and Performances of 7072 Aluminum Alloy |
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| DOI： |
| 中文关键词: Ti 7072铝合金 显微组织 力学性能 电化学 |
| 英文关键词:Titanium 7072 aluminum alloy microstructure mechanical properties electrochemistry |
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| 摘要点击次数: 7258 |
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| 中文摘要: |
| 通过透射电镜、扫描电镜、拉伸试验和电化学测试等方法,系统研究了Ti元素的添加对模拟钎焊态7072铝合金热传输材料的显微组织、不同条件下力学性能与电化学性能的影响规律.透射电镜分析表明，Ti元素的添加对晶粒尺寸的影响微弱，且对析出相的析出有抑制作用.力学试验结果表明，Ti元素对钎焊态合金的高温力学性能有很大的影响.常温下含Ti合金的拉伸力学性能与无Ti合金相近.但在150℃测试时，屈服强度可提高5.5 MPa，抗拉强度和延伸率基本不变.在200℃测试时，抗拉强度可提高近10 MPa，屈服强度和延伸率略有下降.电化学试验结果表明，添加Ti元素能提高钎焊态7072铝合金的抗腐蚀性能，可使7072铝合金在0.5% NaCl溶液、3.5% NaCl溶液和1M NaCl+0.3M H2O2溶液中的腐蚀电位分别正移8.3 mV、11 mV和8.5 mV. |
| 英文摘要: |
| In the present work, the effect of Ti addition on the microstructure, mechanical properties and electrochemical properties of simulated brazing 7072Al alloy was investigated. Transmission electron microscopy (TEM) observations revealed that, in simulated brazing state, there was no much difference in the grain size of the Ti containing alloy and the Ti free alloy and Ti containing alloy had less dense precipitates. Tensile testing results indicated that the room temperature tensile properties of Ti containing alloy were close to those of Ti free alloy. Ti addition could have great influence on the comprehensive mechanical properties of the simulated brazing alloys tested at elevated temperatures. At 150℃ the yield strength increased by 5.5 MPa due to Ti alloying. Whereas, the tensile strength increased by nearly 10 MPa at 200℃. Electrochemical testing results revealed that, with Ti addition, the corrosion resistance of the simulated brazing alloy was improved by showing a positive shift of the corrosion potential. In 0.5% NaCl solution , 3.5% NaCl solution and 1M NaCl+0.3M H2O2 solution, corrosion potential increased by 8.3 mV,11 mV and 8.5 mV, respectively. |
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