摘要
采用X射线衍射、扫描电子显微镜和差热分析等方法研究了机械球磨及热处理对Mg-La-Ni系Mg-59%LaNi5和Mg-63%LaNi5合金的组织形貌及热稳定性的影响.研究结果表明:经转速为280 r·min-1球磨250 h后,Mg-La-Ni系合金主要由镧、镁、镍等非晶和Mg2Ni(Mg-59%LaNi5)或MgNi2(Mg-62%LaNi5)纳米晶组成;大多数粉末呈球形或近球形,Mg-59%LaNi5和Mg-62%LaNi5合金颗粒直径分别为0.10～15.20 μm和0.05～13.90 μm,其中,Mg-59%LaNi5和Mg-62%LaNi5分别约有87%和90%的颗粒直径为0.50～2.00 μm;经763 K保温35 d后,Mg-59%LaNi5的相组成由热稳定性较强的Mg2NiLa,Mg2Ni和Mg17La2组成;Mg-62%LaNi5合金由热稳定性较强的Mg2NiLa,Mg2Ni和MgNi2相组成,其平均晶粒尺寸分别为26.9 nm和25.3 nm.
The effects of mechanical alloying and heat treatment on the phase composition and thermal stability of the novel Mg-La-Ni alloys were studied by X-ray diffraction, scanning electron microscope, differential thermal analysis. The results show that the amorphous structure and nanocrystal can be obtained in the alloys after mechanical alloying for 250 h at 280 r · min-1, and the shape of particles is sphere or spheroid, the size of particles is 0.10-15.2 μm (Mg-5%LaNi5) and 0.05-13.90 μm (Mg-62%LaNi5), 87% (Mg-59%LaNi5) and 90% (Mg-62%LaNi5) of the particles are 0.50-2.00 μm. After heat treated for 35 d at 763 K, the alloys are stable and composed of Mg2NiLa, Mg2Ni, Mg17La2 phases (Mg-59%LaNi5) or Mg2NiLa, Mg2Ni, MgNi2 phases (Mg-59%LaNi5) with the average grain size of 26.9 nm (Mg-59%LaNi5) or 25.3 nm (Mg-62%LaNi5).
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第1期10-14,共5页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(5017024)
广西自然科学基金资助项目(0135053)
关键词
储氢合金
机械合金化
相组成
热稳定性
hydrogen storage alloys
mechanical alloying
phase composition
thermal stability
