金属塑性加工用钢的压缩力学性能及其意义

用压缩试验法测试了ＧＣｒ１５退火状态的塑性流动的应力应变曲线以及高速钢模具材料的压缩力学性能，并对其结果进行了分析讨论，同时强调了压缩力学性能指标对于金属塑性加工及模具应用的力学意义与实用价值。     

Room-temperature dry sliding wear behavior of γ-Ni/Mo2Ni3Si metal silicide “in situ” composites

Ni-base solid solution (γ) toughened Mo₂Ni₃Si metal silicide “in situ” composites were fabricated with different volume fraction of Mo₂Ni₃Si primary dendrite uniformly distributed in irregular Mo₂Ni₃Si/γ eutectic matrix. Results of room-temperature dry sliding wear tests indicated that the composite with a medium volume fraction of primary Mo₂Ni₃Si phase possessed the best wear resistance by optimum combination of the unique mechanical property of Laves phase Mo₂Ni₃Si and toughening effect of ductile γ phase. The primary wear mechanism is microplowing and soft-abrasion of the interdendritic Mo₂Ni₃Si/γ and subsequent brittle fracture of the hard Mo₂Ni₃Si primary dendrites. Ductile γ phase provided good toughening effect to Mo₂Ni₃Si Laves phase during dry sliding wear process.     

乙二醇水热还原法制备纳米银

利用乙二醇在高温下的还原特性,在水热条件下制备了纳米银粒子,并通过透射电镜、X射线衍射、紫外吸收光谱对其结构进行了表征.研究结果表明:所制备的纳米银具有面心立方相的多晶结构,平均粒径在30nm左右,紫外吸收峰的位置在380 nm左右.分散剂和体系中含水量对纳米银的粒径有一定影响.     

Electrochemical properties of Mg-based alloys containing carbon nanotubes

In this work, effects of partial substitution of Mg, Ni with AB₂ in Mg-based alloy and subsequent surface modification by further ball-milling with carbon nanotubes (CNTs) on electrochemical properties were investigated. Mg_1.9(AB₂)_0.1Ni_0.8 (AB₂=LaNi₂, LaNiCo and LaNiMn) alloys were prepared by solid-state diffusion method, the nanocrystalline Mg-based alloys were prepared by ball-milling the mixture of obtained Mg_1.9(AB₂)_0.1Ni_0.8 alloys and nickel powder. It was found that the electrochemical capacities of nanocrystalline Mg_1.9(AB₂)_0.1Ni_1.8 alloys were measured to be 460–490 mAh/g. The nanocrystalline Mg-based alloys containing carbon nanotubes (10 wt.%) obtained by ball-milling after 60 min were demonstrated to show improved electrochemical properties with respect to the original nanocrystalline Mg-based alloys. The electrochemical reaction activity was detected by electrochemical impedance spectra (EIS). Raman and X-ray photoelectron spectroscopy (XPS) proved the interaction between Mg_1.9(AB₂)_0.1Ni_1.8 alloys and carbon nanotubes after ball-milling, which resulted in an increase in the surface Ni/Mg ratio.     

Study of δ-hydrides in Ti-2Al-2.5Zr and Ti-4Al-2V alloys

The α alloy Ti-2Al-2.5Zr and near α alloy Ti-4Al-2V were hydrogenated to various levels. The morphology,orientation relation (OR), and habit plane of the hydrides were studied by means of transmission electron microscopy (TEM). It was found that in the two alloys most of the precipitates are δ-hydrides which have fcc structure with the lattice parameter a = 0.44 nm. Two basic orientation relationships and habit planes of the precipitates are determined. Twin structure was observed in both alloys.     

面向RMP的等离子堆焊过程自动控制技术研究

介绍了根据多层等离子堆焊进行快速金属成形的原理，开发了堆焊过程控制软件。与数控系统结合实现了等离子堆焊过程自动控制，并对影响堆焊质量的主要参数进行控制。该软件系统界面友好、直观，运行可靠，操作简便。     

电化学法处理废硬质合金直接回收金属钴和碳化钨

首次采用电化学法处理废硬质合金直接回收金属钴和碳化钨，工艺简单可靠，具有较好的环境和经济效益。     

氢对Ti-2Al-2.5Zr钛合金疲劳性能的影响

研究了4种含量的氢对Ti-2Al-2.5Zr钛合金疲劳性能的影响。结果表明，自然含氢量的材料具有最好的疲劳性能。而当疲劳载荷大于材料的屈服强度时，氢含量对疲劳寿命基本没有影响；低于屈服强度后，疲劳寿命随着氢含量的升高而和。认为固溶的原子氢导致驻留滑移带软化，裂纹萌生提前，造成在较大△σ时充氢试样的疲劳寿命降低；而材料中氢化物对驻留滑移带（PSB）的阻碍作用导致氢化物与基体分离 而成为裂纹源，是小△σ下疲劳寿命降低扩要原因。     

2VQS发动机气缸罩冲压成形数值模拟分析

本文应用Ｌｓ－Ｄｙｎａ３ｄ非线性有限元件对桑塔纳２０００型轿车ＶＱＳ发动机气缸罩冲压成形过程进行了详尽的有限元模拟分析，通过与实测结果的比较、表明有限元预测结果可靠的。