Accession Number : AD0804947

Title :   FAULTING IN COLD-WORKED FE-SI ALLOY FILINGS.

Descriptive Note : Technical rept.,

Corporate Author : YALE UNIV NEW HAVEN CT DEPT OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s) : Wagner, Christian N. J. ; Aqua, Edward N.

Report Date : NOV 1966

Pagination or Media Count : 18

Abstract : Dilute Fe-Si alloys (0-5%Si) were cold worked by making filings at room temperature. The analysis of the broadening of the X-ray powder pattern peaks yields anisotropic particle sizes normal to the (110), (100) and (211) planes which are a consequence of deformation faults (probability alpha) and twin faults (probability beta). The combined fault probability (1.5alpha + beta) increases from 0.01 in pure Fe to 0.02 in Fe5%Si. The root mean square strains vary with crystallographic orientation due to elastic anisotropy of the alloys, and increase from about 0.0035 in pure Fe to 0.005 in Fe5%Si measured in the (100) direction. Assuming that deformation and twin faults occur with equal probability, the X-ray data would imply that the stacking fault energy does not change upon alloying. It is estimated that the stacking fault energy is of the order of 50 erg/sq cm in all Fe-Si alloys. (Author)

Descriptors :   (*IRON ALLOYS, COLD WORKING), (*SILICON ALLOYS, COLD WORKING), METALLURGY, ANISOTROPY, DEFORMATION, CRYSTALLOGRAPHY, COMPUTER PROGRAMS, FOURIER ANALYSIS, X RAY DIFFRACTION, THEORY.

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE