Nd元素对强流脉冲电子束处理后Al-18Si-3Mg 合金组织及性能的影响
首发时间:2020-04-23
摘要:通过向经强流脉冲电子束(HCPEB)处理过后的Al-18Si-3Mg合金中添加稀土元素Nd,以达到改善微观组织结构以及提升合金性能的目的。本实验利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、显微硬度计等一系列检测手段研究了通过添加元素Nd,对Al-18Si-3Mg合金的组织结构及力学性能的影响。SEM结果表明:Nd元素能够起到细化初晶硅的作用,同时可有效消除熔坑结构。XRD结果表明:将Nd元素添加到铝硅合金中,没有相变产生,衍射峰随脉冲次数的增加将出现一定程度宽化和偏移现象。显微硬度测试结果表明:Nd元素的添加会导致硬度降低,同时通过控制脉冲次数的增加,合金显微硬度也会递增。另外,通过往复摩擦试验发现,Nd元素能够提升合金的耐磨性。结论:稀土Nd的添加能够明显改善电子束处理形成的熔坑结构,并且使用电子束处理添加金属镁和稀土Nd过共晶铝硅合金,能有效提升合金的机械性能。
关键词: 强流脉冲电子束; 过共晶铝硅合金; 稀土钕; 熔坑结构
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Al-18Si-3Mg after Nd element treatment with high pulsed electron beam Effect of alloy structure and properties
Abstract:By adding rare earth element Nd to the Al-18Si-3Mg alloy treated by HCPEB, the purpose of improving microstructure and improving alloy performance is achieved. In this experiment, a series of detection methods such as scanning electron microscope (SEM), X-ray diffractometer (XRD), and micro hardness tester were used to study the effect of adding element Nd on the structure and mechanical properties of Al-18Si-3Mg alloy. SEM results show that: Nd element can play the role of refining primary silicon, and can effectively eliminate the crater structure. XRD results show that when Nd is added to the Al-Si alloy, no phase transition occurs, and the diffraction peak will show a certain degree of broadening and shifting with the increase of the number of pulses. The microhardness test results show that: the addition of Nd element will cause the hardness to decrease, and by controlling the increase of the number of pulses, the microhardness of the alloy will also increase. In addition, through the reciprocating friction test, it was found that the Nd element can improve the wear resistance of the alloy. Conclusion: The addition of rare earth Nd can significantly improve the crater structure formed by electron beam treatment, and the use of electron beam treatment to add metal magnesium and rare earth Nd hypereutectic aluminum-silicon alloy can effectively improve the mechanical properties of the alloy.
Keywords: high-current pulsed electron beam hypereutectic aluminum-silicon alloy rare earth neodymium crater structure
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Nd元素对强流脉冲电子束处理后Al-18Si-3Mg 合金组织及性能的影响
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