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Preparation of nonequlibrium bulk alloys by shock compression and the physical properties

冲击压缩制备非平衡块体合金及其物理性能

基本信息

批准号：
10450261
负责人：
MASHIMO Tsutomu
金额：
$ 6.66万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

Shock compression can be used for the consolidation of nonequilibrium material powders without recrystallizing or decomposition, taking advantage of the high pressure and short duration. On the other hand, so many metastable solid solution powders and thin films, which can not appear in an equilibrium state, were prepared by the rapid quenching, vapor deposition, mechanical alloying (MA) processes, etc. The purpose of this study is to prepare the nonequilibrium bulk alloys of immiscible systems using the MA treatment and shock compression, and investigate the physical properties such as magnetic property and mechanical property.We for the first time prepared the metastable bulk alloys consisting of solid solution and nano-crystals in perfect immiscible system of W-Cu, W-Ag, the metastable bulk alloy consisting solid solution and amorphous phase in immiscible system of Fe-W, the solid-solution bulk alloys in immiscible systems of Fe-Cu. The metastable bulk alloys including solid solutio … More n were prepared also on the Co-Cu and Cr-Cu systems. The Vickers hardnesses of these bulk bodies were much higher than those of the respective pure metals. The electrical conductivities of W-Cu and W-Ag systems were found to be higher than the respective pure metals. We prepared the fine-particle bulk alloy in Fe-Co system (miscible system) with a high coercivity for target materials. It was found that the FCC phase solid solution also showed ferromagnetic property, and the BCC and FCC solid solutions of Fe-Cu system showed the Slater-Porling curve as the other transition metal alloys by the magnetic moment measurement at 4K.That of the Co-Cu system were also consistent with the Slater-Porling curve. It was found that by the Mossbauer spectra experiment, the Fe-phase solid solution of Fe-W system showed the magnetically split spectra (ferromagetic), while the W-phase solid solution and an amorphous phase showed no magnetically split spectrum, which were consistent with the magnetic moment measurement results. Less

冲击压缩具有压缩压力高、压缩时间短等优点，可用于非平衡态材料粉末的无再结晶、无分解的固结。另一方面，通过快速淬火、气相沉积、机械合金化等工艺制备了大量的亚稳态固溶体粉末和薄膜，这些粉末和薄膜不能在平衡状态下出现。本研究的目的是利用机械合金化处理和冲击压缩制备不互溶体系的非平衡块体合金，首次在W-Cu，W-Ag，W-Cu，W-Ag，W-Cu，Fe-W不互溶体系中的亚稳块体合金由固溶体和非晶相组成; Fe-Cu不互溶体系中的固溶体块体合金。包括固溶体在内的亚稳块体合金 ...更多信息在Co-Cu和Cr-Cu体系上也制备了n。这些块状体的维氏硬度比相应的纯金属的维氏硬度高得多。发现W-Cu和W-Ag体系的电导率高于各自的纯金属。我们在Fe-Co系（混溶系）中制备了对靶材具有高矫顽力的细颗粒块体合金。结果表明，FCC相固溶体也具有铁磁性，Fe-Cu系的BCC和FCC相固溶体在4K下的磁矩测量结果与其他过渡金属合金一样呈现Slater-Porling曲线，Co-Cu系的磁矩测量结果也与Slater-Porling曲线一致。通过穆斯堡尔谱实验发现，Fe-W系的Fe相固溶体出现了磁劈裂谱（铁磁谱），而W相固溶体和非晶相没有出现磁劈裂谱，这与磁矩测量结果一致。少