THE CRYSTAL STRUCTURE OF ZrAl

Journal Article · Fri Jun 01 04:00:00 EDT 1962 · Acta Cryst.

DOI:https://doi.org/10.1107/S0365110X62001656· OSTI ID:4828437

Spooner, J F; Wilson, C G

The crystal structure of the intermetallic phase ZrAl was determined from x-ray powder films of impure specimens. Several alloys were prepared by arc melting suitable quantities of the pure metals in argon to give a composition of 50 at.% for each component, but all the films showed the presence of considerable quantities of the neighboring phase Zr/sub 2/Al/sub 3/. According to the phase diagram for the zirconium--aluminum system, the stable composition range for ZrAl is ondy a few at.% and furthermore the alloy is unstable above 1250 deg C. It is apparent that the preparation of a pure specimen of ZrAl is difficult, and metallographic examination of the polished specimens showed the presence of two phases, Zr/sub 2/Al/sub 3/ and ZrAl. The sharply defined lines belonging to the Zr/sub 2/Al/sub 3/, whose structure is now known, were rejected. Apart from a few unidertified lines, the remaining lines were indexed on the basis of an orthorhombic unit cell of dimensions similar to that given by Edshammar for HfAl; the dimensions found were a = 3.359 plus or minus 0.001, b = 10.887 plus or minus 0.003, and c =4.274 plus or minus 0.001 A. (N.W.R.)

• Research Organization: Royal Military Coll. of Sciences, Shrivehnam, Swindon, Wiltshire, Eng.
• NSA Number: NSA-16-021051
• OSTI ID: 4828437
• Journal Information: Acta Cryst., Journal Name: Acta Cryst. Vol. Vol: 15
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALUMINUM ALLOYS
ARGON
CLEANING
CRYSTALS
ELECTRIC ARCS
FILMS
HAFNIUM ALLOYS
HIGH TEMPERATURE
IMPURITIES
INERT GASES
INTERMETALLIC COMPOUNDS
LATTICES
MELTING
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
PHASE DIAGRAMS
POWDERS
PREPARATION
QUANTITATIVE ANALYSIS
STABILITY
STANDARDS
X RADIATION
ZIRCONIUM ALLOYS