Accession Number:

AD0266327

Title:

LONG-RANGE ORDER IN FE RICH FE-AL ALLOYS. IV: AN X-RAY DIFFRACTION STUDY

Descriptive Note:

Scientific note,

Corporate Author:

TECHNION - ISRAEL INST OF TECH HAIFA

Personal Author(s):

Report Date:

1961-07-01

Pagination or Media Count:

30.0

Abstract:

Long-range order was studied as a function of quenching temperature by x-ray diffraction integra ed int nsity m asurements from a polycrystalline sheet 25 at- Al and from a single crystal 29 at- Al. FeAl type order was independent of the quenching temperature from which it is concluded that maximum possible order had been attained. Fe3Al type order decreased continuously with increasing quenching temperature indicating a second order transformation for FeAl order in equilibrium with Fe3Al order. The critical temperatures for this latter transformation were 558 C 25 Al and 545 C 29 Al. Only about 80 of the maximum possible Fe3Al order was attained for the 29 alloy. N O ABSOLUTE DETERMINATION WAS MADE FOR THE alloy. Broadening of the Fe3Al order, 111 superstructure line was observed and interpreted as due to particle size broadening from anti-phase domains. This is apparently the first direct evidence of growth anti-phase domains in BCC-based ordering systems. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE