随机互溶的固溶体是高熵合金典型的组织,包括FCC、BCC以及HCP结构。此外,非晶态相也会在合金中生成。 (4)已证实的性能特点: 研究表明,高熵合金具有众多优于传统合金的优能。目前,性能上的五大效应已被证实,其分别为低层错能、热稳定性、抗辐照、抗腐蚀以及易于克服性能上的“trade-off”效应。易金新材 CoCrFe...
Fujieda的和Shiratori的研究发现,除了B2/BCC相外,EBMed AlCoCrFeNi样品中还产生了FCC相,而铸态样品甚至原料粉末中都没有发现FCC相。形成FCC相的原因是FCC相在EBM的预热温度(950°C)下热力学稳定。在微观和纳米尺度上分析了元素的波动。在铸造和EBMed样品的晶界处都可以观察到Fe和Cr的偏析,如图5b所示。此外,在EBM...
随着沉积高度的增加,顶部和中间区域的微观结构转变为具有交替的FCC和BCC相的片状共晶结构(图9a1和9b1)。图9a2-9c2显示了DED ed样品的反极图(IPF)图,BCC相和FCC相具有各自的结晶取向。在顶部和中间区域(图9a2和9b2),FCC相在相邻的共晶集落中表现出不同的结晶取向,而BCC相在相邻共晶集落中表现出相似的结晶取向...
随机互溶的固溶体是高熵合金典型的组织,包括FCC、BCC以及HCP结构。此外,非晶态相也会在合金中生成。 (4)已证实的性能特点: 研究表明,高熵合金具有众多优于传统合金的优能。目前,性能上的五大效应已被证实,其分别为低层错能、热稳定性、抗辐照、抗腐蚀以及易于克服性能上的“trade-off”效应。易金新材 共晶Al...
Despite this complex behavior, it is found that there is no fundamental difference in the shear coupling behavior between FCC Ni and BCC Fe grain boundaries: (1) all types of transitions in shear coupling behavior that are observed in FCC Ni are also found in BCC Fe; (2) the grain ...
In this study, the shear coupling behavior of 388 FCC Ni and 408 BCC Fe grain boundaries is surveyed under a wide range of temperatures (e.g., 100 – 1000 K in Ni and 100 – 1400 K in Fe) via the recently developed ramped synthetic driving force method with free end boundary conditio...
随机互溶的固溶体是高熵合金典型的组织,包括FCC、BCC以及HCP结构。此外,非晶态相也会在合金中生成。 (4)已证实的性能特点: 研究表明,高熵合金具有众多优于传统合金的优能。目前,性能上的五大效应已被证实,其分别为低层错能、热稳定性、抗辐照、抗腐蚀以及易于克服性能上的“trade-off”效应。易金新材 AlCoC...
Films of Co, Ni, and Cu, which are normally fcc or hcp crystals at room temperature, were grown on single-crystal Fe(100) substrates to induce bcc ordering. Both Co and Ni grow as bcc(100) films on iron, but the Cu films are disordered. This is in contrast to epitaxy of Cu on ...
Unlike traditional alloy systems, SP-CSAs are composed of two to five principal elements that form random solid solutions in the simple underlying fcc or bcc lattices21,22,23,24. It is assumed that high-level lattice distortion and chemical complexity in SP-CSAs can substantially reduce the ...
the electronic structure of alloys with the DV-Xα molecular orbital method, in which the important parameter Md¯ represents an average energy level of d orbitals of transition metals and is used to predict the phase stability of FCC-γ matrix and the precipitation of TCP phase31,32,33,34...