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Ovisnost metalurških svojstava kubnih kristala o titranju rešetke

Authors :
Butt, Muhammad Zakria
Kalsoom, Um Ul
Source :
Fizika A : a journal of experimental and theoretical physics, Volume 8, Issue 2
Publication Year :
1999
Publisher :
Croatian Physical Society, 1999.

Abstract

The Debye-Waller thermal parameter B is a measure of the mean-square amplitude of atomic vibrations hu2i. For monoatomic cubic crystals in which the vibrations are isotropic, B = 8πhu2i/3. In this study, it is observed that various metallurgical properties, e.g., ultimate tensile strength, creep-onset temperature, recrystallisation temperature, activation energy for grain boundary self-diffusion, solubility limit, etc. of cubic elements are a unique function of their B-factors. The power regression formula Y = Y0(B/B0)M depicts the correlation between a metallurgical property Y and the Debye-Waller thermal parameter B. The regression coefficient Y0 and regression power M are determined by the least-squares method, while B0 is a constant which makes the equation dimensionally homogeneous.<br />Debye-Wallerov termički parametar B je mjera srednje-kvadratne amplitude atomskog titranja hu2i. Za monoatomske kubne kristale, koji pokazuju isotropno titranje, B = 8πhu2i/3. U ovom se radu pokazuje kako se niz metalurških svojstava, npr., čvrstoća, temperatura pojave plastične deformacije, temperatura rekristalizacije, aktivacijska energija za difuziju kroz granice kristalića, granica topivosti i druga, elemenata kubne strukture, mogu prikazati jednim izrazom kao funkcije njihovih B-faktora. Regresijska relacija Y = Y0(B/B0)M daje tu korelaciju metalurškog svojstva i Debye-Wallerovog termičkog parametra B. Regresijski koeficijent Y0 i regresijski eksponent M određuju se metodom najmanjih kvadrata, dok je B0 konstanta kojom se postiže dimenzijska homogenost relacije.

Details

Language :
English
ISSN :
13339125 and 13300008
Volume :
8
Issue :
2
Database :
OpenAIRE
Journal :
Fizika A : a journal of experimental and theoretical physics
Accession number :
edsair.od.......951..0064c830881701ad739f52a967e48896