Determination of RuAl phase boundaries in binary Ru–Al phase diagram at room temperature and 1200 °C

Abstract Binary Ru–Al alloys with nominal compositions from 29.39 at.% Al up to 60.47 at.% Al were manufactured by powder-metallurgy processing. Single-phase RuAl with a homogeneous microstructure was prepared which is difficult to achieve by melting metallurgy. The microstructure and lattice parameters of the alloys were investigated by optical and scanning electron microscopy, energy-dispersive spectroscopy, wavelength-dispersive spectroscopy and X-ray diffraction. The parametric method was employed to determine the RuAl phase boundaries. Single-phase RuAl was found to exist from near-stoichiometry up to 53.8 at.% Al at room temperature and up to 54.5 at.% Al at 1200 °C, respectively. In addition, the phase Ru2Al3 was found to be stable at room temperature and to have a very narrow range of stoichiometry.

[1]  F. Mücklich,et al.  Effects of particle size and pressure on the reactive sintering of RuAl intermetallic compound , 2004 .

[2]  F. Mücklich,et al.  Investigation on point defect structure in single phase B2 type RuAl alloys by lattice parameter measurements , 2003 .

[3]  B. Grushko,et al.  A study of the Al-rich part of the Al–Ru alloy system , 2003 .

[4]  F. Mücklich,et al.  Formation of Al2O3 Scales on Single-Phase RuAl Produced by Reactive Sintering , 2003 .

[5]  F. Mücklich,et al.  Properties of eutectic Ru–Al alloy produced by ingot metallurgy , 2002 .

[6]  Stuart R. Stock,et al.  Elements of X-ray Diffraction, Third Edition , 2001 .

[7]  X. Ren,et al.  A unified model for point-defect formation in B2 intermetallic compounds , 2000 .

[8]  H. Buchkremer,et al.  Some reactive processing aspects of high-temperature aluminides Nb3Al and RuAl , 1997 .

[9]  I. Wolff.  Toward a better understanding of ruthenium aluminide , 1997 .

[10]  I. Wolff.  Synthesis of RuAl by reactive powder processing , 1996 .

[11]  M. Kogachi,et al.  Point defect behavior in the B2 type intermetallic compounds CoAl , 1996 .

[12]  L. Cornish,et al.  Investigation of the aluminium-ruthenium phase diagram above 25 at.% ruthenium , 1996 .

[13]  L. Cornish,et al.  Investigation of the high aluminium end of the aluminium-ruthenium phase diagram , 1996 .

[14]  Y. Shirai,et al.  Determination of vacancy concentration and defect structure in the B2 type NiAl β-phase alloys , 1996 .

[15]  K. Sumiyama,et al.  Nanocrystalline B2 type Ru40A160 and Ru powders produced by mechanical alloying and leaching , 1994 .

[16]  R. Fleischer.  Substitutional solutes in AlRu—I. Effects of solute on moduli, lattice parameters and vacancy production , 1993 .

[17]  R. Fleischer.  Boron and off-stoichiometry effects on the strength and ductility of AIRu , 1993 .

[18]  R. Fleischer,et al.  Mechanical properties of high-temperature alloys of AlRu , 1991 .

[19]  S. Anlage,et al.  Phase equilibria for the aluminum-rich region of the AlRu system , 1988 .

[20]  G. Sastry,et al.  Phase Transformations in Rapidiy Quenched Aluminium-Ruthenium Alloys , 1982 .

[21]  P. Nielsen,et al.  The Crystal Structure of RuAl6. , 1968 .

[22]  C. Djerassi,et al.  An X-Ray Investigation of Ruthenium-Aluminium Alloys. , 1966 .

[23]  B. Nyberg,et al.  The Crystal Structure of Ru4Al13. , 1965 .

[24]  H. Nowotny,et al.  Die Verbindungen RuAl2 und OsSi1,5: Kurze Mitteilung , 1963 .

[25]  K. Zieliński,et al.  Announcements , 1974, Nature.