激光焊接在欧洲造船业的应用

为了在竞争中获胜，欧洲造船业必须提高生产速度和效率，同时降低成本。因此，他们投入了巨大的人力和财力来研发激光焊接并将其应用到造船生产实践中，以达到维持和重建欧洲船厂在全球高附加值船舶市场的优势地位。     

Mobilities in Diffusion in Alpha Brass

Diffusion coefficients and mobilities were determined as functions of concentration in the a phase of the Cu-Zn system. Use was made of incremental diffusion couples to determine the Kirkendall effect at various concentrations. Darken’s analysis was used to calculate the individual diffusion coefficients and mobilities from these data. The general diffusion coefficient is a single-valued function of the concentration in this system to within the limits of accuracy of the experimental methods used. The form of the various functions (diffusion coefficients and mobilities) of concentration is the same in every case: it is essentially the same as the usual D vs c curve.     

Corrosion damage in welded joints in containers

The design of ultrasonic butt welded joints in rigid plastics with additional compressive force is investigated. Two methods of introducing the energy of ultrasonic oscillations in the immediate vicinity of the welding zone with the tangential introduction of the oscillations and the relative displacement of the welded elements in the joint plane and welding with two-sided tangential introduction of the oscillations are discussed.     

Recent progress in metallic glasses in Taiwan

The recent research and development on metallic glasses in Taiwan over the past decade is reviewed in this paper. The major focus was to develop tougher bulk metallic glasses (BMGs), bulk metallic glass composites (BMGCs), and thin film metallic glasses (TFMGs), mostly in Zr and Mg based systems. Due to the Taiwan industry characteristics, metallic glasses are favored in the application for micro-electro-mechanical systems (MEMS), including micro- or nano-imprinting for optoelectronic devices and hologram patterns.     

俄罗斯黄金冶金技术发展局部

概括介绍俄罗斯金冶金技术发展状况,以飨读者。     

消失模铸造碳钢件内部增碳的研究

用EPS做模型，干砂造型在负压的状态下浇注碳钢，系统研究影响各种工艺条件下EPC法生产碳钢件内部增碳的因素。发现模型分别用石英粉、刚玉粉、锆英粉3种涂料涂覆，浇注碳钢件均有内部增碳现象发生，其中使用石英粉涂料的铸件内部增碳较小，采用底注式浇注，同一铸件随着铸件高度的增加，内部增碳增加。另外，随真空度的增加内部增碳减小。     

挤压铸造合金材料的研究进展

简述了合金材料压力下结晶的强化机理研究状况;讨论了挤压铸造铝合金、锌合金、镁合金及其复合材料的研究进展;指出合理的挤压铸造工艺可细化合金显微组织,提高铸件致密性,改善合金力学性能.     

我国熔模铸造的可持续发展

介绍了我国环保方面的法律、法规和标准，并结合熔模铸造工艺的实际情况，剖析了从制模、制壳、熔炼、浇注、以及清理、切割等熔模铸造生产过程中，经常可能出现的污染源.在此基础上对我国熔模铸造的可持续发展，提出了一些意见和建议。     

聚合物淬火剂的细菌问题分析及对策

聚合物淬火剂由于其显著的优点应用日益广泛。但使用中往往会滋生细菌,不仅加速了聚合物淬火剂的老化,而且有加速工件生锈、影响环境卫生等弊病。聚合物淬火剂中细菌的滋生与所用聚合物和水的质量,淬火系统的循环状况,pH值,杂屑杂油以及空气中的细菌等因素有关。使用好富顿生物稳定的产品AquaQuench245是一个解决细菌滋生的最佳方案。     

The Soret effect in diffusion in crystals

The Soret effect, as it occurs in the diffusion of solutes in crystals, is analyzed using the principle of microscopic reversibility whereby an approach is developed for interpreting and computing Q¹, the heat of transport. To compute the transport of energy during the diffusion jump process, and then Q¹, the processes of thermal activation to the transition state and the decay from the transition state are considered to be inverses; thus the net process is reduced to the analysis of the purely mechanical decay process. Molecular statics and dynamics are then suggested as the means to simulate the decay process and the case of carbon diffusion in body-centered cubic α-iron is so analyzed as an example. Our results show that, for the case Q¹ ≈ −Q_m, where Q_m is the activation energy for carbon diffusion, this is in agreement with experimental evidence reported in the literature. Thus both the sign and magnitude of Q¹ are correctly predicted. Various cases, such as the diffusion of substitutional solutes and vacancies, are also considered within our approach along with implications for future study.