共查询到19条相似文献,搜索用时 62 毫秒
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简单介绍了国内外关于快重离子低温辐照非晶态合金引起的各向异性的塑性形变研究新进展,并对该领域今后的研究方向作了展望. Present status in study of fast heavy ion beam induced plastic deformation in amorphous alloys is briefly reviewed. Further research trend and relevant problems are also discussed. 相似文献
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利用兰州重离子加速器(HIRFL)提供的2.79MeV/u Ar离子,在50K以下的低温辐照了Fe47Ni29V2Si6B16等4种非晶态合金样品,室温下使用光学显微镜对辐照前、后的同一样品拍照,对比测量了样品的宏观尺寸. 结果表明:在辐照剂量为1.5×1014离子/cm2时,非晶态合金形变不明显,测量到的样品宽度相对增长Δb/b0均小于1.0%;当辐照剂量增加到1.6×1015离子/cm2时,所有非晶态合金样品都发生了显著的形变,其宽度相对增长分布在4.3%—12.0%之间,对此结果进行了定性的分析. 相似文献
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本文研究非晶态Co70Cr20Zr10合金在居里温度附近的磁性,样品的磁特性符合二级相变规律。得到临界指数β=0.45±0.02,γ=1.9±0.1,δ=5.13±0.05。Co70Cr20Zr10合金的居里温度为Tc=(186.7±0.2)K。临界指数β,γ,δ满足γ=β(δ-1)关系,但临界指数值都偏离三维Heisenberg模型的理论值,这种行为可能起源于非晶态合金磁的不均匀性。讨论了Kouvel-Fisher(K-F)参数γ(T)对温度T的依赖关系。
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In this work we analyzed the mechanical damping behavior of amorphous Pd77.5Cu6.0Si16.5 below the glass transition temperature (T
g) with creep/recovery measurements. Here a correlation between temperature stimulation and external stress is found in an
exponential, multiplicative way. This demonstrates that not only is the yield stress of the material influenced by temperature
variation (mechanical melting) but also the secondary relaxation is modified under stress and temperature. 相似文献
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G. Schumacher S. Klaumünzer S. Rentzsch G. Vogl 《Zeitschrift für Physik B Condensed Matter》1980,40(1-2):19-21
Irradiation of the metallic glass Pd80Si20 with high energy Ar-ions at low temperatures resulted in electrical resistance increases of about 5% at a measuring temperature of 10 K after fluences of 3·1015 Ar/cm2 indicating that defects were created by radiation damage. Annealing experiments were performed up to 150°C showing a smooth recovery throughout the whole temperature range. 相似文献
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C. G. Windsor 《Physics letters. A》1979,70(5-6):485-488
Inelastic neutron scattering can be used to measure the energy spectrum of the normal modes of vibration of a glass. We present measurements of the spectrum for the metal-metalloid glass Pd80Si20 at 300 K. They show a principal peak around 23 meV energy followed by a rapid fall. In these respects they closely resemble the known spectrum from crystalline pure palladium. We conclude that the inter-metallic forces in the metal-metalloid glass are not greatly modified from those in the crystalline form of the metal constituent. 相似文献
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非晶Ti80Si20合金在高压下加热时,不发生多相分解,并直接转变为bcc-Ti(Si)过饱和固溶体,这可能与Ti有较大的压缩率及固溶所造成的弹性能比较小等因素有关。
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在室温下和4.2K下测定了非晶Fe80B20-xMx合金(M=P,C)的穆斯堡尔吸收谱。利用分布参数拟合程序得到了超精细内场Hi和同质异能移IS同类金属成份的变化关系。利用这些结果考察了非晶合金的微观结构,比较了两类结构模型:Bernal-Polk模型和微晶模型。对比非晶合金和它们的相应晶相的行为得知,这类非晶合金中不存在微晶近程序,Bernal-Polk模型对描述TM-M类非晶合金的微观结构优于微晶模型。
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用转靶X射线源及弯晶EXAFS谱仪测定了Fe80B20及Fe80Si6B14金属玻璃中铁的X射线K吸收谱。由EXAFS谱确定了两种金属玻璃的近邻结构参量。此外,通过测定XANES谱并与纯铁及其有关的化合物Fe2B,FeB中铁的XANES比较发现:吸收边能量、“白线”结构等均出现一些变化,表明两种金属玻璃的近邻原子Fe-B,Fe-Si以及Fe-Fe之间的相互作用比铁与硼所形成的稳定化合物中要强,这对于决定金属玻璃的短程序结构具有重要的作用。
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