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首页> 外文学位 >The Influence of Zinc Content, Strain Rate, and Deformation Temperature on the Thermomechanical Compression of Magnesium-Zinc-Cerium Alloys.
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The Influence of Zinc Content, Strain Rate, and Deformation Temperature on the Thermomechanical Compression of Magnesium-Zinc-Cerium Alloys.

机译：锌含量，应变速率和变形温度对镁-锌-铈合金热机械压缩的影响。

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摘要

A recent focus on environmental preservation has led to a call for increasing in fuel efficiency and the reduction of vehicle emissions. One approach that U.S. automakers intend to take to address this issue is increasing vehicle efficiency through weight reduction. Additionally, a redistribution of the vehicle center of gravity can increase safety through enhanced handling and control. Magnesium is an attractive material due to having the lowest density among engineering materials however its use to date has been hindered by its relatively low ductility, strength, and tendency to exhibit galvanic corrosion. A Mg-Zn-Ce alloy has been developed which greatly reduces these shortcomings and presents itself as an acceptable candidate to lower vehicle front-end weight. Though this alloy system has shown drastic formability increases over pure magnesium and other Mg-based alloy systems, relatively little is understood about the behavior of this system. This study examined the compression behavior of this alloy at different zinc contents, deformation temperatures, and strain rates. It was observed that the lowest zinc content (2 wt.%) was the most formable as it was able to be compressed over the largest range of strain rates and temperatures. Through a metallurgical examination of the raw material and deformed samples it was seen that at low temperatures samples were able to accommodate imposed stress via twinning. High deformation temperatures showed evidence of dynamic recrystallization. An electron microscopy examination showed that there was a large amount of zinc segregation at the grain boundaries, and showed intergranular fracture modes suggesting that detrimental zinc increases were detrimental. An EBSD analysis showed randomized as-cast grain orientation, as well as randomly oriented grains in recrystallized regions suggesting heterogeneous texture played a large role in increasing ductility.
机译：最近对环境保护的关注导致呼吁提高燃油效率和减少车辆排放。美国汽车制造商打算采用的一种解决此问题的方法是通过减轻重量来提高车辆效率。此外，重新分配车辆重心可以通过增强的操纵和控制来提高安全性。镁由于在工程材料中具有最低的密度而成为有吸引力的材料，但是迄今为止，由于其较低的延展性，强度和表现出电腐蚀的特性，镁的使用受到了阻碍。已开发出一种Mg-Zn-Ce合金，可大大减少这些缺点，并作为降低车辆前端重量的可接受候选者。尽管与纯镁和其他基于Mg的合金系统相比，该合金系统已显示出极大的可成形性，但对该系统的行为知之甚少。这项研究检查了该合金在不同锌含量，变形温度和应变速率下的压缩行为。观察到最低的锌含量（2重量％）是最易成型的，因为它能够在最大的应变速率和温度范围内被压缩。通过对原材料和变形后的样品进行冶金检查，可以发现在低温下，样品能够通过孪晶适应施加的应力。高变形温度显示出动态再结晶的迹象。电子显微镜检查表明，在晶界处有大量的锌偏析，并且显示出晶间断裂模式，这表明有害的锌增加是有害的。 EBSD分析表明，铸态晶粒的取向随机，再结晶区域的晶粒随机取向，这表明异质织构在增加延展性方面起着重要作用。

著录项

  • 作者

    Thome, Andrew J.;

  • 作者单位

    Lehigh University.;

  • 授予单位 Lehigh University.;
  • 学科 Engineering Materials Science.
  • 学位 M.S.
  • 年度 2012
  • 页码 91 p.
  • 总页数 91
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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