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Study on the Forming-Ability of Metastable Phases in Vapor Quenched Alloys Using High Temperatrue X-ray Diffraction

高温X射线衍射研究气相淬火合金亚稳相的形成能力

基本信息

批准号：
01550507
负责人：
SUMIYAMA Kenji
金额：
$ 1.41万
依托单位：
Tohoku University (1990)Kyoto University (1989)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

In this project, we studied temperature-dependence of the structure and physical properties of nonequilibrium alloys produced by sputtering (vapor quenching process from high energy states) and obtained the following results.1) Using the high temperature sample stage, which was introduced by the present grant and installed on the X-ray diffraction equipment, we could observe X-ray diffraction patterns temperatures between 350 - 850 ^ﾟC.2) We observed X-ray diffraction patterns, magnetization, electrical resistivity, differential scanning calorimetry and Mossbauer spectra for amorphous Fe-Cu-Ag alloys produced by DC facing target type sputtering. The amorphous alloys crystallize above 400 K and transform to a metastable fcc phase with the same concentrations. They separate into pure bcc Fe and the pure fcc Cu and Ag above 670 K.3) We observed X-ray diffraction patterns, magnetization and electrical resistivity for nonequilibrium Fe-W alloys. The nonequilibrium Fe-rich bcc phase separate … More s into a more Fe-rich alpha phase and an intermetallic compound, the lambda phase, above 770 K. The amorphous phase displays high thermal stability and the crystallized temperature is about 1170 K. Above 1170 K. it transforms to the lambda phase and the bcc phase, but dose not transform to the mu phase which is the high temperature equilibrium phase.4) We observed X-ray diffraction patterns, magnetization and magnetostriction of nonequilibrium Fe-Pd alloys. The nonequilibrium Fe-rich bcc phase is maintained as a metastable phase below 470 K, but it separates into a more Fe-rich bcc phase and a Pd-rich fcc phase at 470 - 570 K. Above 570 K, moreover, the phase separation is enhanced and the disordered fcc phase becomes the L1_0 type ordered phase.These experimental results indicate that the metastable phase formation in the transient process from nonequilibrium phases to equilibrium phases by annealing breaks through the classical metallurgy based upon the equilibrium thermodynamics. We intend to do measurements of EXAFS and neutron diffractions. Less

在本项目中，我们研究了溅射（高能态蒸气淬火工艺）生产的非平衡合金的结构和物理性能的温度依赖性，并得到了以下结果。1）利用本次引进并安装在X射线衍射设备上的高温样品台，我们可以观察到温度在350 - 850^ﾟC之间的X射线衍射图。2）我们观察到了X射线直流面对靶型溅射生产的非晶 Fe-Cu-Ag 合金的衍射图样、磁化强度、电阻率、差示扫描量热法和穆斯堡尔谱。非晶态合金在 400 K 以上结晶，并转变为具有相同浓度的亚稳态面心立方相。它们在 670 K 以上分离成纯 bcc Fe 和纯 fcc Cu 和 Ag。3）我们观察了非平衡 Fe-W 合金的 X 射线衍射图案、磁化强度和电阻率。非平衡富Fe的bcc相在770 K以上分离成更富Fe的α相和金属间化合物λ相。非晶相表现出较高的热稳定性，结晶温度约为1170 K。高于1170 K，它转变为lambda相和bcc相，但不转变为高温平衡的mu相 4)我们观察了非平衡Fe-Pd合金的X射线衍射图样、磁化强度和磁致伸缩。非平衡的富Fe bcc相在470 K以下保持为亚稳相，但在470 - 570 K时分离成更富Fe的bcc相和富Pd的fcc相。此外，在570 K以上，相分离增强，无序的fcc相变成L1_0型有序相。这些实验结果表明，瞬态过程中亚稳相的形成从通过退火将非平衡相转变为平衡相突破了基于平衡热力学的经典冶金学。我们打算进行 EXAFS 和中子衍射的测量。较少的