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A Study on Amorphous Formation of Alloys Solidified Under High Pressure

高压凝固合金非晶形成的研究

基本信息

批准号：
05650735
负责人：
KAGAWA Akio
金额：
$ 1.41万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650735/
关键词：
High Pressure High-Pressure phase diagram Bismnth Antimony Germanium High-Pressure phase Metastable phase Amorphaus

项目摘要

On Several combinations of volume-expanding and -shrinking elements on solidification, their high-pressure phase diagrams were estimated and three alloy systems where amorphous formation could be expected, i.e., Bi-Sb alloys (homogeneous solid solution-type), Bi-In alloys (intermediate compound formation-type) and Al-Ge alloys (eutectic-type), were subjected to the high-pressure experiment. In the X-ray diffraction pattern of Bi-10-30Sb alloys, a broad peak was detected at 2rheta=30-40deg.and the peak was thereafter disappeared and, instead, the normal pressure phase was observed. In the microstructure, a fine-grained structure was observed and considered to appear as a result of phase transformation from a high-pressure phase to the normal-pressure one. In Bi-20at%In alloy solidified under high-pressure, no distinct change was observed in the X-ray diffraction pattern. However, an increase in the amount of Bi/BiIn eutectic was found, suggesting that the eutectic composition was shifted to Bi-rich side, and the high-pressure phase diagram of Bi-In system was estimated. In the X-ray diffraction pattern of Al-40at%Ge alloy, solidified at about 20kbar, the peaks of metastable phases, gamma_1 (Al_2Ge) and gamma_2 (AlGe), were detected and these metastable phases still existed after 2 months. The gamma_1 and gamma_2 phases were appeared as a laminar eutectic in the BSE comp. image and the average Ge concentration of the gamma_1/gamma_2 eutectic was found to be higher by 8at%Ge than that of normal eutectic, alphaAl/dia.cub.Ge. The high-pressure phase diagram of Al-Ge system was estimated and the critical pressure for the generation of the gamma_1/gamma_2 eutectic was estimated to be 10-20kbar.

估算了几种体积膨胀和收缩元素在凝固过程中的高压相图，并进行了预期非晶形成的三种合金系统，即BiSb合金(均相固溶体类型)、BiIn合金(中间化合物形成类型)和Al-Ge合金(共晶型)的高压实验。在Bi-10-30Sb合金的X射线衍射图中，在2hita=30-40℃处出现一个宽峰，此后峰消失，而是观察到常压相。在显微组织中，观察到细晶组织，认为这是高压相向常压相转变的结果。在高压凝固的Bi20at%In合金中，X射线衍射图没有明显的变化。但发现BiIn共晶数量增加，表明共晶成分向富铋侧移动，并估算了BiIn系的高压相图。在20kbar左右的凝固温度下，Al-40at%Ge合金的X射线衍射图上出现了亚稳相--γ_1(Al_2Ge)和γ_2(AlGe)峰，2个月后这些亚稳相仍然存在。在BSE中，γ_1和γ_2相以层状共晶形式存在。结果表明，Ge平均浓度比正常共晶αAl/dia.cu.Ge高8at%Ge。估算了Al-Ge系的高压相图，估算了产生共晶的临界压力为10-20kbar。