Microstructure and mechanical properties of slowly cooled Cu47.5Zr47.5Al5

Cu47.5Zr47.5Al5 was prepared by arc melting and solidified in situ by suction casting into 2-5-mm-diameter rods under various cooling rates (200-2000 K/s). The microstructure was investigated along the length of the rods by electron microscopy, differential scanning calorimetry and mechanical properties were investigated under compression. The microstructure of differently prepared specimens consists of macroscopic spherical shape chemically inhomogeneous regions together with a low volume fraction of randomly distributed CuZr B2 phase embedded in a 2-7 nm size clustered "glassy-martensite" matrix. The as-cast specimens show high yield strength (1721 MPa), pronounced work-hardening behavior up to 2116 MPa and large fracture strain up to 12.1-15.1%. The fracture strain decreases with increasing casting diameter. The presence of chemical inhomogenities and nanoscale "glassy-martensite" features are beneficial for improving the inherent ductility of the metallic glass.

露天矿边坡动态整治方法及其应用--以福建潘洛铁矿滑坡整治为例

露天矿边坡属于人工边坡,它的形成不仅时间长,而且一直处于动态过程中.露天矿滑坡在一定范围内是允许的,滑坡治理的目的是保证矿山在开采期限内安全采出设计境界内的矿石.基于这些特征,在文中提出了适合露天矿滑坡治理的新方法-动态治理法及其可行性,并以潘洛铁矿露天矿滑坡灾害治理为例,对该方法的应用进行了论述.可为露天矿滑坡治理所借鉴.

设备与管道保温的最优化设计方法

本文论述了隔热技术应用研究的重要内容之一,设备与管道保温的最优化设计方法.首先,提出了优选隔热材料的简化方法;其次,提出了变导热系数隔热材料用于输热管道与储热箱的最优化隔热设计方法,并在蒸汽管道保温应用中,取得了重大的节能和经济效益;第三,论述了输热管道多层隔热保温的最优化设计方法,由传热模型计算的热损失值与复合隔热层交界面温度与实验值吻合得较好.