论文部分内容阅读
采用强流脉冲电子束技术对Mg-Gd-Y-Zr和Mg-Nd-Zn-Zr两种镁稀土合金进行表面改性处理,并研究了处理后镁合金表层的相组成、形貌和性能变化。结果表明:Mg-Gd-Y-Zr合金经脉冲电子束处理后表层的Mg5Gd转变为Mg3Gd,而Mg-Nd-Zn-Zr合金表层的Mg12Nd相消失形成过饱和固溶体。两种稀土镁合金经脉冲电子束处理后均发生熔化和部分汽化,在快速凝固后表面形成波状形貌,且表面生成大量孪晶。脉冲电子束处理使得两种镁合金表面硬度显著提高。在模拟体液中的腐蚀测试结果显示,上述合金经强流脉冲电子束表面处理后自腐蚀电位均提高,但腐蚀电流密度有所增加。脉冲电子束处理后镁稀土合金表面组织成分均匀化、晶粒细化,稀土元素在镁中的固溶以及缺陷的生成导致表层硬度的提高和耐腐蚀性的改变。
The surface modification of Mg-Gd-Y-Zr and Mg-Nd-Zn-Zr Mg-Nd-Zn-Zr rare earth alloys was carried out by high-current pulsed electron beam and the phase composition, morphology and properties of the treated Mg alloy surface were studied Variety. The results show that the surface Mg5Gd of Mg-Gd-Y-Zr alloy is transformed into Mg3Gd after pulsed electron beam treatment, while the Mg12Nd phase of Mg-Nd-Zn-Zr alloy disappears to form supersaturated solid solution. Both rare earth magnesium alloys were melted and partially vaporized after pulsed electron beam treatment. After rapid solidification, wavy morphology was formed on the surface and a large number of twins were generated on the surface. Pulsed electron beam treatment resulted in significantly higher surface hardness of both magnesium alloys. The results of corrosion test in simulated body fluids showed that the corrosion potentials of the above alloys increased after the surface treatment with high-intensity pulsed electron beam, but the corrosion current density increased. Pulsed electron beam treatment Magnesium rare earth alloy composition of the surface homogenization, grain refinement, rare earth elements in magnesium and defects in the formation of the resulting surface hardness and corrosion resistance changes.