...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Metals >Fatigue Behavior of the Rare Earth Rich EV31A Mg Alloy: Influence of Plasma Electrolytic Oxidation
【24h】

Fatigue Behavior of the Rare Earth Rich EV31A Mg Alloy: Influence of Plasma Electrolytic Oxidation

机译：富含稀土的EV31A镁合金的疲劳行为：等离子电解氧化的影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Rare earth rich magnesium alloys are used in aerospace and automotive fields because of their high specific strength and good castability. However, due to their low corrosion resistance, protective surface treatments, such as conversion coating or electroless plating are necessary, when they have to be used in humid or corrosive environments. The present study was aimed at evaluating the effect of plasma electrolytic oxidation (PEO) and different surface roughness (Ra ≈ 0.8 μm and Ra ≈ 0.3 μm) on the rotating bending fatigue of an innovative Mg alloy, with a high content of Nd (up to 3.1 wt %) and Gd (up to 1.7 wt %). Fatigue tests revealed a 15% decrease in the fatigue strength of the PEO-treated alloy (fatigue strength = 88 MPa) with respect to the bare alloy (fatigue strength = 103 MPa). The reduction of fatigue strength was mainly due to the residual tensile stresses induced by the PEO treatment. The effect of surface roughness on the bare alloy was, instead, negligible. The mechanisms of crack initiation were similar in the untreated and PEO-treated alloy, with crack nucleation sites located in correspondence to large facets of the cleavage planes.
机译：富含稀土的镁合金由于其高比强度和良好的铸造性而被用于航空航天和汽车领域。但是，由于它们的低耐腐蚀性，当必须在潮湿或腐蚀性环境中使用时，必须进行保护性表面处理，例如转化涂层或化学镀。本研究旨在评估等离子电解氧化（PEO）和不同表面粗糙度（Ra≈0.8μm和Ra≈0.3μm）对高含量Nd（向上）的新型Mg合金的旋转弯曲疲劳的影响。至3.1重量％）和Gd（至多1.7重量％）。疲劳试验表明，相对于裸合金（疲劳强度= 103 MPa），经PEO处理的合金（疲劳强度= 88 MPa）的疲劳强度降低了15％。疲劳强度的降低主要是由于PEO处理引起的残余拉伸应力。相反，表面粗糙度对裸合金的影响可以忽略不计。在未经处理和经PEO处理的合金中，裂纹萌生的机理相似，裂纹成核位点与解理平面的大切面相对应。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号