Results 201 to 210 of about 474,991 (233)

Influence of lattice misfit on heterojunction bipolar transistors with lattice-mismatched InGaAs bases

Journal of Applied Physics, 1988
AlGaAs/InGaAs/GaAs heterojunction bipolar transistors (HBTs) with lattice-mismatched InGaAs bases have been studied for determining the effect of misfit defects on device performance. Defect structures were investigated using scanning cathodoluminescence and transmission electron microscopy.
Y. Ashizawa, S. Akbar, W. J. Schaff, L. F. Eastman, E. A. Fitzgerald, D. G. Ast   +5 more
openaire   +1 more source

Thermodynamic properties and lattice misfit of Ir-based superalloys

Intermetallics, 2013
Abstract First principles calculation reveals that the temperature-dependent heat capacities of Ir and four Ir3X (X = Ti, Nb, Zr, and Hf) phases at a certain temperature are very close to each other due to their similar densities of states of phonons, and for each phase, the difference between CP and CV is also very small.
C.P. Liang, H.R. Gong
openaire   +1 more source

Lattice Misfit and Decomposition in Ni-Al-Mo Alloys

MRS Proceedings, 1989
ABSTRACT The effect of lattice mismatch δ between the γ-matrix and γ'-precipitates on the decomposition process of Ni-Al-Mo alloys has been investigated. The results show that for δ = 0 spherical precipitates are formed without any orientational correlation. For δ > 0 non-spherical particles, aligned along <100>, are produced.
Hector Calderon, Gernot Kostorz
openaire   +1 more source

Effects of Re and Co additions on lattice parameters and lattice misfit in cast Ni-based superalloys

Materials Testing, 2022
Abstract Morphological evolution of gamma prime precipitates was governed by an elemental partitioning ratio between the gamma and gamma prime phases. In the present study, Ni-based MGA 1400 alloy was modified by adding 4 wt% of Re and 6.4 wt% of Co by vacuum arc melting.
Arpaporn Nararak, Napat Kiatwisarnkij, Tanaporn Rojhirunsakool, Sriswaroop Dasari, Sankum Nusen, Gobboon Lothongkum, Thomas Lampke, Fritz Hartung, Jiaqian Qin, Panyawat Wangyao   +9 more
openaire   +1 more source

The Role of Lattice Misfit on Heterogeneous Nucleation of Pure Aluminum

Metallurgical and Materials Transactions A, 2016
α-Alumina (Al2O3) single crystals with different termination planes were used as heterogeneous nucleation substrates for liquid aluminum to varying lattice misfits at the interface between substrate and newly nucleated aluminum grain. Undercooling during the nucleation process was measured for interface configurations with varied lattice misfit, while ...
L. Wang, L. Yang, D. Zhang, M. Xia, Y. Wang, J. G. Li   +5 more
openaire   +1 more source

Heteroepitaxy of Large-Misfit Systems: Role of Coincidence Lattice

Crystal Research and Technology, 2000
We present a detailed study about the epitaxial growth of various modern materials systems with large lattice misfit to GaAs substrates. The epitaxial alignment during the initial stage of growth and the misfit accommodation process are determined by the particular interface structures which we have investigated by high-resolution transmission electron
A. Trampert, K.H. Ploog
openaire   +1 more source

Misfit Dislocation Energy in a Crystal with Lattice Parameter Gradient

Japanese Journal of Applied Physics, 1974
Expressions are derived for the strain, stress, displacement and energy associated with a single misfit dislocation located in the diffusion zone of two epitaxial crystals with differing lattice parameters, assuming a linear gradient of lattice constant.
Gabriel G. Cillié, Johannes H. van der Merwe   +1 more
openaire   +1 more source

Critical Misfits for Lattice-Matched Strained Monolayers

1988
Epitaxial thin layers or multilayers can now be grown with a high degree of perfection using ultra high vacuum evaporation techniques. Although it is still in general difficult to predict which material can be grown onto a particular substrate, a number of qualitative guidelines may be extracted from existing theories.
openaire   +1 more source

Characterization and visualization of the lattice misfit associated with dislocation cores

Acta Materialia, 2005
Atomic misfit associated with a crystal dislocation is manifested by displacements of atoms from their positions in the perfect lattice. The discrete character of the crystal lattice and the nature of interatomic bonds distribute this misfit over the plane normal to the dislocation line. The Nye tensor, which describes the distribution of the resultant
C HARTLEY, Y MISHIN
openaire   +1 more source

Ultrastrong steel via minimal lattice misfit and high-density nanoprecipitation

Nature, 2017
Next-generation high-performance structural materials are required for lightweight design strategies and advanced energy applications. Maraging steels, combining a martensite matrix with nanoprecipitates, are a class of high-strength materials with the potential for matching these demands.
Jiang, S., Wang, H., Wu, Y., Liu, X., Chen, H., Yao, M., Gault, B., Ponge, D., Raabe, D., Hirata, A., Chen, M., Wang, Y., Lu, Z.   +12 more
openaire   +3 more sources