Y. Zhang
金属学报(英文版)
The effects of electromagnetic stirring on the microstructures of pipe-line steel SAWdeposited metal were investigated. The results showed that electromagnetic stirringincreased the number density of inclusions with 0.2-0.6μm in diameter and promotedthe formation and refining of acicular ferrite within austenite grains. The low tem-perature toughness of deposited metal was improved.
关键词:
electromagnetic stirring
,
null
,
null
Y. Zhang
,
D.J. Wen
,
null
,
null
金属学报(英文版)
Ni3+ and Cr3+ doped Fe-Mn-Co-Cu-O spinels were prepared by solid phase sintering. The valence states and distribution of transition ions in the spinel crystals are being inferred from the consideration of thermodynamic principle and crystalline field theory. The microstructure and performance of those are studied by XRD, FT-IR and IRE-2 infrared radiant instrument. Ni3+ and Cr3+ occupy the vacancies or substitute the other ions in the spinel structure and formed diverse spinel structure, which exhibits infrared integral emissivities of 0.93 in the whole bands, and 0.94 in the bands within 14~25μm too. The content of Fe2O3 and MnO2 in the spinel crystals changes maybe induces infrared radiativity of spinels differently.
关键词:
Crystal structure
,
null
,
null
Y. Zhang
材料科学技术（英文）
Tensile tests were performed on iron nanopillars oriented along [001] and [110] directions at a constant temperature of 300 K through molecular dynamics simulations with an embedded-atom interatomic potential for iron. The nanopillars were stretched until yielding to investigate the onset of their plastic deformation behaviors. Yielding was found to occur through two different mechanisms for [001] and [110] tensions. In the former case, plastic deformation is initiated by dislocation nucleation at the edges of the nanopillar, whereas in the latter case by phase transformation inside the nanopillar. The details during the onset of plastic deformation under the two different orientations were analyzed. The varying mechanisms during plastic deformation initiation are bound to influence the mechanical behavior of such nanoscale materials, especially those strongly textured.
关键词:
Iron
