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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Consolidation of Cu_(58)Zr_(42) amorphousanocrystalline powders by PM
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Consolidation of Cu_(58)Zr_(42) amorphousanocrystalline powders by PM

机译：PM固结Cu_（58）Zr_（42）非晶/纳米晶体粉末

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摘要

Cu_(58)Zr_(42) amorphousanocrystalline composite particles were prepared by ball-milling. The powders were used as base-material of compact samples produced by powder metallurgy (PM). After 3.5 h mechanical milling, the powders were predominantly amorphous, which were analysed by XRD to define the amorphous fraction, by TEM and SEM to reveal the microstructure, by DSC to observe the processes during heating in the powder. The structure of the powder shows that in the amorphous part coexist crystalline areas sized 10-20 nm and short range order sized below 10 nm. By PM, cylindrical green compacts were produced using uniaxial cold pressing at 1 GPa and without any lubricant. The aim was to obtain compact samples without any changes in the amorphousanocrystalline fraction. The sintering temperature is restricted by the onset of crystallisation temperature (T_x) which causes the change of the amorphous/crystalline structure. Based on the DSC plots of the powders, temperature of 563 K and 723 K were chosen for sintering.
机译：通过球磨制备Cu_（58）Zr_（42）非晶/纳米晶复合颗粒。这些粉末用作粉末冶金（PM）生产的致密样品的基础材料。机械研磨3.5小时后，粉末主要为非晶态，通过XRD分析确定无定形部分，通过TEM和SEM揭示微观结构，通过DSC观察粉末加热过程。粉末的结构表明，在非晶态部分中，共存尺寸为10-20 nm的晶体区域和尺寸小于10 nm的短程晶体区域。通过粉末冶金，在1 GPa的压力下使用单轴冷压法生产圆柱形生坯，而没有任何润滑剂。目的是获得致密的样品，而无定形/纳米晶部分没有任何变化。烧结温度受到结晶温度（T_x）的开始的限制，该温度引起非晶/晶体结构的变化。基于粉末的DSC图，选择了563 K和723 K的温度进行烧结。

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