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

冲击压缩可用于非平衡材料粉末的固结而不发生再结晶或分解，利用高压和短持续时间的优势。另一方面，通过快速淬火、气相沉积、机械合金化（MA）等方法制备了许多不能出现平衡态的亚稳态固溶体粉末和薄膜。本研究的目的是通过MA处理和冲击压缩制备非混相体系的非平衡体合金，并研究其物理性能，如磁性能和力学性能。首次制备了W-Cu、W-Ag完全不混相体系中由固溶体和纳米晶组成的亚稳体合金，Fe-W不混相体系中由固溶体和非晶相组成的亚稳体合金，Fe-Cu不混相体系中由固溶体和非晶相组成的固溶体合金。在Co-Cu和Cr-Cu体系上制备了包括固溶体在内的亚稳态大块合金。这些体体的维氏硬度远高于相应的纯金属。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体系（混相体系）中制备了具有高矫顽力的细颗粒体合金作为靶材料。通过4K磁矩测量发现，FCC相固溶体也表现出铁磁性，Fe-Cu体系的BCC和FCC固溶体与其他过渡金属合金一样表现出Slater-Porling曲线。Co-Cu体系也符合Slater-Porling曲线。通过穆斯堡尔谱实验发现，Fe-W体系的fe相固溶体表现出磁分裂谱（铁磁性），而w相固溶体和非晶相则不表现出磁分裂谱，这与磁矩测量结果一致。少

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