【作者】 邓敏；

【导师】 黄菊花；

【作者基本信息】 南昌大学 ， 材料加工工程， 2006， 硕士

【摘要】 近年来，镁合金的研究和应用已受到美、德、澳、日等发达国家和地区的高度重视，加大了对镁合金开发和应用研究的投入，并且相继出台了一些大规模的镁研究计划。目前已经开发的镁合金有百余种，主要有Mg—Al，Mg—Zn，Mg—Mn，Mg—Zr和Mg—RE等5个合金系。近年来，镁合金在汽车领域、电子领域、通信领域以及国防工业领域的应用日益广泛。 镁合金由于其常温下塑性成形性能差，因此在镁合金加工技术方面受到了一定限制。目前，镁合金加工技术有镁合金铸造技术、镁合金塑性加工技术和超塑性成形技术。虽然传统压铸技术工艺比较成熟，新兴压铸技术也改善了传统压铸技术的弊端，但是由于压铸技术自身的特点，在某些方面无法与塑性成形技术相比。如对于薄壁镁合金部件的成形，采用压铸方法会产生过多的废料，而且达不到要求的强度和塑性，表面出现裂纹、轴线缩松和内部裂纹等缺陷。而镁合金板料塑性成形产品由于其性能的优异性使镁合金板料塑性成形工艺的研究备受重视，镁合金板料塑性成形的研究无疑将是塑性成形领域的又一大热点。 本文针对隶属于Mg—Al—Zn系的MB2镁合金板料和隶属于Mg—Mn—RE系的MB8镁合金板料，进行了大量的加热塑性成形实验，得出相关数据和关系曲线，研究了这两种牌号镁合金板料塑性成形性能与成形温度、速度和润滑条件之间的关系；通过观察塑性成形后的金相组织，研究成形工艺参数对板料金相组织的影响；并对MB8镁合金进行了高温力学拉伸实验，研究了温度、速度与力学性能的关系。 主要研究内容包括： 研究了MB2镁合金板料成形性能与工艺参数(成形温度、成形速度和润滑剂)之间的关系，获得了在不同工艺参数下板料成形性能的规律，得到了MB2镁合金板材的最佳成形工艺参数，根据有关公式计算得到了该成形工艺参数下的极限拉深比。最后，通过金相显微镜观察了拉深成形以后其组织的变化，分析了金相组织结构与工艺参数之间的关系。 首次研究了MB8镁合金的成形性能与工艺参数之间的关系，探索了镁合金与成形温度、成形速度和润滑条件之间的关系，得到了MB8镁合金板材的最佳成形工艺参数，以及该工艺参数下的极限拉深比。通过电子显微镜观察了塑性成形之后的组织结构变化。 将MB2与MB8两种镁合金的实验结果对比，得出了镁合金板料的Ce元素，在合理的含量比例下，能够有效改善镁合金板料的塑性成形性能的结论更多还原

【Abstract】 The research and application of magnesium-alloy has been regarded in USA, Germany, Australia and Japan during recent years. There are many research plans and devotion of magnesium R&D. At present, there are more than 500 kinds of magnesium alloys, included Mg-Al, Mg-Zn, Mg-Mn, Mg-Zr and Mg-RE system. With the rapid development of automobile and electronic industry, especially the communication industry, this is a big chance for magnesium alloy.Because the deform performance of magnesium alloy is bad, the processing technology is limited. The kinds of the processing technology are Magnesium Casting Technology, Magnesium Plastic Deforming Technology and Super-Plastic Forming Technology. But the intrinsic character of die-casting technology, the plastic deform technology is more advantaged. For example, there are too much flotsam, surface crack, axis-loosen and inner crack if the die-casting product is thin wall part, at the same time, the intension and the plastic performance are not enough. At latest years, the plastic processing technology research is more important, and it is a new area.The article is described about MB2magnesium and MB8 magnesium. The MB2 magnesium belongs to Mg-Al-Zn system, and the MB8 belongs to Mg-Mn-RE system. The data and graphs are concluded from lots of heated plastic deform experiments. The relationship between performance and temperature, velocity, lubrication will be achieved. There are some microstructure experiment for the purpose of getting the relationship between forming parameters and microstructure. The relationship between mechanics performance and temperature speed by high temperatureextension experiment for MB 8 magnesium alloy. The main contents include:The relationship and rules between MB2 magnesium alloy formability and technology parameters include temperature, velocity and lubrication is acquired. The first-rank forming parameters are obtained. The LDR (Limited Drawing Ratio) of forming which are running under the first-rank parameters are calculated by relative formula. The transformation of microstructure has been observed by metal microstructure microscope after forming. The reason is analyzed.The relationship between MB8 magnesium alloy formability and technology parameters has been investigated. The optimal parameters and LDR are acquired. Also the更多还原