在围压下岩石弹性波速的研究

本文介绍在单轴和三轴压缩下岩石的纵波波速、横波波速、动弹性模量、动剪切模量和动泊松比及强度等物理力学参数的变化规律及其与力学特性的关系,同时综述一定围压下温度对岩石弹性波速的影响。     

Effects of annealing on microstructures and electrochemical properties of La0.8Mg0.2Ni2.4Mn0.10Co0.55Al0.10 alloy

The La0.8Mg0.2Ni2.4Mn0.10Co0.55Al0.10 alloy was prepared by induction melting. The structural and morphological characterizations were performed by means of X-ray powder diffraction （XRD） and scanning electron microscopy （SEM）. The electrochemical measurements were performed using LAND and CH/660b electrochemical workstation. The main phases of the alloy were LaNi5 and （La,Mg）Ni3. After annealing, the maximum discharge capacity, cycle stability and high rate dischargeability （HRD） were improved obviously. The maximum discharge capacity reached 373.80 mAh/g （T=1173 K）, the C100/Cmax（%） was 72.63% （T=1173 K）, and the value of HRD reached 51.8% at a discharge current density of 1150 mA/g （T=1173 K）. The cyclic voltammetry （CV） and potentiodynamic polarization were also studied.     

电磁加热多元合金共渗技术

紧固件热浸镀锌往往存在锌瘤,旋合性能较差、拉力载荷低,影响装配,一般螺母镀后需进行机械加工。探讨了电磁加热多元合金共渗工艺及其共渗效果,结果表明,紧固件在共渗后螺纹部位无锌瘤,而且旋合良好,共渗层比热浸镀锌镀层均匀,钝化后的共渗层表面质量接近电镀锌。本工艺节电效果明显,一次投资较少,综合效益好。     

Effects of annealing on microstructures and electrochemical properties of La0.8Mg0.2Ni2.4Mn0.10Co0.55Al0.10 alloy

The La0.8Mg0.2Ni2.4Mn0.10Co0.55Al0.10 alloy was prepared by induction melting. The structural and morphological characterizations were performed by means of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical measurements were performed using LAND and CHI 660b electrochemical workstation. The main phases of the alloy were LaNi5 and (La,Mg)Ni3. After annealing, the maximum discharge capacity, cycle stability and high rate dischargeability (HRD) were improved obviously. The maximum discharge capacity reached 373.80 mAh/g (T=1173 K), the C100/Cmax(%) was 72.63% (T=1173 K), and the value of HRD reached 51.8% at a discharge current density of 1150 mA/g (T=1173 K). The cyclic voltammetry (CV) and potentiodynamic polarization were also studied.     

新型稀土高性能储氢合金研究进展

稀土储氢合金是研究最早的储氢合金,也是目前仅有大规模产业化的储氢合金。本文综述了近年来稀土储氢合金的研究进展。介绍了稀土储氢合金的主要制备方法,例如感应熔炼、电弧熔炼、真空磁悬浮熔炼等以及较为新颖的自燃燃烧法;总结了改性处理方法,如热处理、表面处理等;分别讨论了AB5型、R-Mg-Ni系稀土储氢合金的元素组成变化对合金性能的影响。