摘要:

A dynamic Ising model, using effective cluster interactions, has been implemented to model the kinetics of phase separation in a Ti-15 at.% Al alloy. Cluster interactions are defined over clusters containing up to six atoms. The model predicts the rapid development of ordered α2D019regions prior to phase separation. The number and size of the ordered domains are correlated to the reduction in matrix super-saturation. The simulations predict that the α2-phase will form a complex interconnected microstructure.

ISSN:0950-0839    

DOI:10.1080/09500839508240517

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

A method for calculating the activation energy spectrum from isothermal data using Fourier techniques is used for studying the deformation processes in amorphous metals. The influence of experimental error on the calculated spectrum is discussed. The activation energy spectrum derived from the anelastic deformation of Fe40Ni40B20amorphous metallic ribbon is presented. The spectrum obtained involves three well-separated peaks, each of which represents a different material transport mechanism.

ISSN:0950-0839    

DOI:10.1080/09500839508240518

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The width of the wetted region at coherent twin boundaries in L12-ordered Cu-17% Pd has been determined at a set of accurately defined temperatures close to the critical temperatureTc. Analysis of the data shows a significant deviation from a logarithmic divergence of the width very close toTcas previously determined for antiphase boundaries in the same alloy by Ricolleauet al. It is shown that the fluctuations in width may give a consistent description of these deviations.

ISSN:0950-0839    

DOI:10.1080/09500839508240519

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

High-resolution transmission electron micrographs of {1101} interfacial twin dislocations in Ti thin films, previously published in this journal, are re-examined. Computer simulations of the experimental images have been obtained using atomic models deduced by Pond, Bacon and Serra in 1995. Two twin dislocations were analysed, with step heights of4d(K1) and2d(K1), whered(K1) is the spacing of the {1101) planes. Reasonable agreement with the predicted structures is obtained at about 0.17nm resolution.

ISSN:0950-0839    

DOI:10.1080/09500839508240520

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The interfacial structure of [1011] twins obtained using atomic-scale computer simulation by Serra, Pond and Bacon in 1991 is shown to be qualitatively consistent with high-resolution transmission electron micrographs of such twins in Ti obtained by Kasukabe, Yamada, Peng and Bursil in 1993. In addition, images of two twinning dislocations are analysed using a circuit mapping method to determine their Burgers vectors and to demonstrate that they correspond to defects studied previously using computer simulation by Serra, Bacon and Pond in 1988 and by Serra, Pond and Bacon in 1991.

ISSN:0950-0839    

DOI:10.1080/09500839508240521

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The field around a line defect along the axis of an angularly inhomogeneous, elastically anisotropic medium with piezoelectric, piezomagnetic and magnetoelectric coupling has a surprisingly simple form.

ISSN:0950-0839    

DOI:10.1080/09500839508240522

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

σ = 2 grain boundaries in cemented carbide (WC-Co) were investigated by high-resolution electron microscopy on the atomic scale. The following crystallographic relationships were often obtained at the grain boundaries, these originating in the way that the interplanar spacings of the basal plane (0002) and the prism plane (1110) are quite close with a 2% misfit, sincea/c ∼1:

ISSN:0950-0839    

DOI:10.1080/09500839508240523

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:0950-0839    

DOI:10.1080/09500839508240524

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor