The plastic deformation of metals under dynamic loading is related to the evolution of dislocation structure and density which is thermal activation-dependent. The dynamic compressive experiment on LY12 aluminum alloy has been performed by Hopkinson bar at different temperatures. X-ray diffraction line profile analysis is adopted for the tested specimens to investigate the micro-and/or meso-scale structure evolution. The edge character of dislocations in the specimens was determined by analyzing the integral breadths of X-ray diffraction lines. The Fourier analysis of diffraction lines indicates that under dynamic loading, the dislocation density approaches to saturation rapidly at the initial stage of plastic deformation, dislocations are homogeneously distributed in the specimens. It also demonstrates that the dislocation density decreases with increasing testing temperature. Meanwhile the size of substructures has a tendency of broadening with temperature, especially in the range from 280℃ to 300℃ which corresponds to the temperature of dissolution of precipitated phase in the aluminum matrix.
FAN Zhi-Jian
,
SONG Zhen-Fei
,
XIAO Tai-Wu
,
CHEN Bei
. XRD LINE PROFILE ANALYSIS OF LY12 ALUMINUM ALLOY UNDER DYNAMIC COMPRESSIVE EXPERIMENT[J]. Acta Metall Sin, 2011
, 47(5)
: 559
-565
.
DOI: 10.3724/SP.J.1037.2010.00650
[1] Wilkens M. Krist Technol, 1976; 11: 1159
[2] Langford J I, Lou¨er D, Scardi P. J Appl Cryst, 2000; 33: 964
[3] Scardi P, Leoni M. Acta Cryst, 2001; 57A: 604
[4] Ung´ar T, Gubicza J, Rib´arik G, Borb´ely A. J Appl Cryst, 2001; 34: 298
[5] Williamson G K, Hall W H. Acta Metall, 1953; 1: 22
[6] Klug H P, Alexander L E. X–Ray Diffraction Procedures for Polycrystalline and Amorphous Materials. New York: John Wiley, 1974: 634
[7] Balzar D, Popovi´c S. J Appl Cryst, 1996; 29: 16
[8] Warren B E, Averbach B L. J Appl Phys, 1950; 21: 595
[9] Warren B E. X–Ray Diffraction. Reading: Addison–Wesley, 1969: 264
[10] Stephens P W. J Appl Cryst, 1999; 32: 281
[11] Popa N C. J Appl Cryst, 1998; 31: 176
[12] Krivoglaz M A, Ryaboshapka K P. Phys Met Metallogr, 1963; 15: 18
[13] Krivoglaz M A, Martynenko O V, Ryaboshapka K P. Phys Met Metallogr, 1983; 55: 318
[14] Krivoglaz M A. X–Ray and Neutron Diffraction in Nonideal Crystals. New York: Springer–Verlag, 1996: 357
[15] Wilkens M. Phys Status Solidi, 1970; 2A: 359
[16] Wilkens M. In: Simmons J A, De Wit R, Bullough R, eds., Fundamental Aspects of Dislocation Theory National Bureau of Standards Special Publication 317(II).Washington DC: National Bureau of Standards, 1970: 1195
[17] Wilkens M. Phys Status Solidi, 1987; 104A: K1
[18] Klimanek P, Kuzel R. J Appl Cryst, 1988; 21: 59
[19] Kuzel R, Klimanek P. J Appl Cryst, 1988; 21: 363
[20] Ung´ar T, Tichy G. Phys Status Solidi, 1999; 171A: 425
[21] Gubicza J, Kassem M, Rib´arik G, Ung´ar T. Mater Sci Eng, 2004; A372: 115
[22] F´atay D, Bastarash E, Nyilas K, Dobatkin S, Gubicza J, Ung´ar T. Z Metall, 2003; 94: 1
[23] Ung´ar T, Borb´ely A. Appl Phys Lett, 1996; 69: 3173
[24] De Keijser T H, Langford J I, Mittemeijer E J, Vogels A B P. J Appl Cryst, 1982; 15: 308
[25] Thompson P, Cox D E, Hastings J B. J Appl Cryst, 1987; 20: 79
[26] Dieter G E. Mechanical Metallurgy. New York: McGraw–Hill, 1988: 58
[27] Ung´ar T. Mater Sci Eng, 2001; A309–310: 14
[28] Ung´ar T, Tichy G, Gubicza J, Hellming R J. Powder Diffr, 2005; 20: 366
[29] Ung´ar T, Gubicza J, Han´ak P, Alexandrov I. Mater Sci Eng, 2001; A319–321: 274
[30] Valiev R Z, Islamgaliev R K, Alexandrov I V. Prog Mater Sci, 2000; 5: 103
[31] Estrin Y, Molinari, Toth L S, Brechet Y. Acta Mater, 1998; 46: 5509
[32] Arzt E, Ashby M F, Verrall R A. Acta Metall, 1983; 31: 1977
[33] Brammer J A, Percival C M. Exp Mech, 1970; 10(6): 245
