However, for longer milling times, plastic deformation introduces large amounts of stacking faults, especially of twin type, in the hcp structure. As a consequence, some of the hcp Co is converted back into fcc and the hcp unit cell is progressively anisotropically distorted. After long-term ...
結晶固體的某些性質取決於其晶體結構(crystal structure),亦即依原子、離子或分子在空間中的排列情形而定。 圖3.1 3.3 單位晶胞 描述晶體結構時,通常會將整個結構細分為許多具有重覆性的小單元,稱為單位晶胞(unit cell)。對大部分晶體結構而言,單位晶胞是具有三組平行面的平行六面體或稜柱體。 單位晶胞用來表示晶體...
The crystal structure is one of the most dominant factors that strongly affect the properties of an alloy, because the electronic structure changes drastically with the crystal structure1,2. A solid-solution alloy, in which the constituents are randomly mixed at the atomic scale, generally adopts ...
In contrast, atoms with a large B factor generally belong to a part of the structure that is very flexible or is more reac- tive to an ambient environment. The B factor of the fcc and hcp Ru NPs increased slightly with particle size. When comparing fcc Ru NPs and hcp Ru NPs of a ...
1.1.2 空间点阵和晶胞 (5)1.1.3 常见纯金属（FCC、BCC、HCP）的晶体结构7 1.1.4 晶面指数和晶向指数及其标注 (11)1.1.5 标准投影 (15)1.1.6 倒易点阵和晶体学公式 (18)1.1.7 合金相结构 (24)1.1.8 离子晶体结构 (25)1.1.9 共价晶体结构 (30)1.2 难点释疑 (31)1.2.1 7大晶系...
First, the cell assemblies were quasi-hydrostatically pressurized to the desired press load before heating to the target temperature. Before commencing uniaxial deformation, Fe samples were annealed at 723–923 K to ensure full stabilization of hcp-structure and the sample microstructure. Annealing ...
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The latter resonance was also relatively narrow and showed no evidence of quadrupolar structure. Owing to the distinct shifts, growth of the Mg2Al3 phase was monitored as a function of ageing time in Al–10 at.% alloy, which was first quenched from the heat-treated solution at 550 °C ...
It is revealed that the FCC structure is transformed from the HCP structure by the slip of Shockley partial dislocations of 1/6 ⟨12¯10⟩ on every four layers of {101¯0} planes. Moreover, the derived results could clarify the above-mentioned controversy regarding volume expansion ...
crystalstructureofmetals,suchasdensity, deformationprocesses,alloyingbehavior,andmuchmore.Thus,itisimportantto understandmetalstructures. FaceCenterCubicStructure FaceCenterCubicStructureconsistsofanatomateachcubecornerandanatominthe centerofeachcubeface.Ahardsphereconceptcanbeusedtodescribeatomicpackinginunit cells.The...