Cu-Ti-Zr-Ni块体非晶合金的结晶组织分析

采用XRD与TEM技术分析了块体非晶合金Cu52.5Ti30Zr11.5Ni5超过临界形成直径后的结晶组织,发现合金体系中存在CuTi2-Cu10Zr7、Cu3Ti-CuZr、Cu3Ti-Cu10-Zr7-CuZr等共晶组织形式,说明该多元非晶合金的深共晶点是由多个低元的共晶反应组成,熔体中与Cu10Zr7结构类似的局域团簇结构,对该系合金的玻璃形成能力具有重要影响.     

Formation and mechanical properties of bulk Cu-Ti-Zr-Ni metallic glasses with high glass forming ability

Bulk amorphous Cu52.5Ti30Zr11.5Ni6 and Cu53.1Ti31.4Zr9.5Ni6 alloys with a high glass forming ability can be quenched into single amorphous rods with a diameter of 5 mm, and exhibit a high fracture strength of 2 212 MPa and 2 184 MPa under compressive condition, respectively. The stress—strain curves show nearly 2% elastic strain limit, yet display no appreciable macroscopic plastic deformation prior to the catastrophic fracture due to highly localized shear bands. The present work shows clearly evidence of molten droplets besides well-developed vein patterns typical of bulk metallic glasses on the fracture surface, suggesting that localized melting induced by adiabatic heating may occur during the final failure event.     

基于局域网的门窗分布式控制系统的研究和实现

分布式控制是厂房设备控制的发展方向,本文从分布式远程控制系统的网络构成出发,给出了基于TCP/IP的局域网和485总线的分布式控制方案,并将此方案应用到了所开发的大型排烟天窗控制系统的具体工程实践,实践表明,基于分布式远程控制系统对提高控制效率、精度和监控能力,增加工厂的生产力具有重要的意义。