DYNAMICS OF BANDED STRUCTURE FORMATION IN RAPID SOLIDIFICATION

被引:42
作者
KARMA, A
SARKISSIAN, A
机构
[1] Department of Physics, Northeastern University, Boston
关键词
D O I
10.1103/PhysRevLett.68.2616
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Motivated by widespread experimental observations of the "banded structure" in rapidly solidified alloys, we have studied numerically by Green's-function method the dynamics of the planar interface under rapid directional solidification condition. We find that the formation of this structure can be explained and partially characterized quantitatively in terms of highly nonlinear "relaxation oscillations" of the interface whose spacings are controlled by latent heat diffusion but not by the thermal gradient. A comparison with experiment is presented for Al-Fe alloys.
引用
收藏
页码:2616 / 2619
页数:4
相关论文
共 14 条
  • [1] CONTINUOUS GROWTH-MODEL FOR INTERFACE MOTION DURING ALLOY SOLIDIFICATION
    AZIZ, MJ
    KAPLAN, T
    [J]. ACTA METALLURGICA, 1988, 36 (08): : 2335 - 2347
  • [2] THE EFFECT OF RAPID SOLIDIFICATION VELOCITY ON THE MICROSTRUCTURE OF AG-CU ALLOYS
    BOETTINGER, WJ
    SHECHTMAN, D
    SCHAEFER, RJ
    BIANCANIELLO, FS
    [J]. METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1984, 15 (01): : 55 - 66
  • [3] BOETTINGER WJ, 1986, NATO ADV STUDY I E, V114
  • [4] PULSATILE-MODE AND CELLULAR-MODE INTERACTION IN RAPID DIRECTIONAL SOLIDIFICATION
    BRAUN, RJ
    MERCHANT, GJ
    DAVIS, SH
    [J]. PHYSICAL REVIEW B, 1992, 45 (13): : 7002 - 7016
  • [5] CARRARD M, IN PRESS ACTA METALL
  • [6] OSCILLATORY MORPHOLOGICAL INSTABILITIES DUE TO NON-EQUILIBRIUM SEGREGATION
    CORIELL, SR
    SEKERKA, RF
    [J]. JOURNAL OF CRYSTAL GROWTH, 1983, 61 (03) : 499 - 508
  • [7] BANDING PHENOMENA IN AL-FE ALLOYS SUBJECTED TO LASER SURFACE-TREATMENT
    GREMAUD, M
    CARRARD, M
    KURZ, W
    [J]. ACTA METALLURGICA ET MATERIALIA, 1991, 39 (07): : 1431 - 1443
  • [8] JACKSON KA, 1980, LASER ELECTRON BEAM
  • [9] KARMA A, IN PRESS
  • [10] SOLIDIFICATION MICROSTRUCTURES - RECENT DEVELOPMENTS AND FUTURE-DIRECTIONS
    KURZ, W
    TRIVEDI, R
    [J]. ACTA METALLURGICA ET MATERIALIA, 1990, 38 (01): : 1 - 17