TITLE

Phase formation in mechanically alloyed Nb-Al powders

AUTHOR(S)
Hellstern, E.; Schultz, L.; Bormann, R.; Lee, D.
PUB. DATE
October 1988
SOURCE
Applied Physics Letters;10/10/1988, Vol. 53 Issue 15, p1399
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Nb-Al alloys have been prepared by mechanical alloying of elemental crystalline powders and investigated with x-ray diffraction and transmission electron microscopy. Crystalline equilibrium phases form for Al-rich alloys. Amorphous phase formation is observed for the Nb50Al50 composition. Mechanically alloyed powders with more than 70 at. % Nb exhibit the metastable bcc (A2) solid solution which transforms after thermal annealing into the A15 phase. Formation of the different phases can be understood by considering the free-energy curves of the amorphous and bcc phases as calculated from the phase diagram and additional thermodynamic data.
ACCESSION #
9828399

 

Related Articles

  • Transformation of Mechanically Alloyed Nb-Sn Powder to Nb3Sn. Patankar, S. N.; Froes, F. H. // Metallurgical & Materials Transactions. Part A;Sep2004, Vol. 35 Issue 9, p3009 

    Nb3 was processed via mechanical alloying (MA). The powder mixture comprised of stoichiometric proportions of elemental niobium and tin powder was mechanically alloyed for 3 hours and the mechanically alloyed powder mixture was heat treated. While MA resulted in Nb-Sn solid solution, the...

  • Nb-W alloy prepared by mechanical alloying and optimal design of corresponding milling variables. Bairu Li; Yongdong Wang; Xing Liu // Advanced Materials Research;2014, Issue 1033-1034, p839 

    The effects of milling variables on the particle sizes and purity of mechanically alloyed Nb-30W powders were quantitatively investigated using orthogonal test of three factors consisting of milling time A (12h, 24h and 48h), ball-to-powder ratio B (6:1, 10:1 and 20:1) and solid-to-liquid ratio...

  • Mechanical alloying of copper with niobium and molybdenum. Botcharova, E.; Freudenberger, J.; Schultz, L. // Journal of Materials Science;Aug2004, Vol. 39 Issue 16/17, p5287 

    Copper has been mechanically alloyed with the bcc structure type elements Nb and Mo in order to obtain a material with high strength, good ductility and good electrical conductivity. In the case of alloying Cu with Nb a solid solution is formed during milling, whereas in the case of alloying Cu...

  • Formation of an amorphous phase and its crystallization in the immiscible Nb-Zr system by mechanical alloying. Al-Aqeeli, N.; Suryanarayana, C.; Hussein, M. A. // Journal of Applied Physics;Oct2013, Vol. 114 Issue 15, p153512 

    Mechanical alloying of binary Nb-Zr powder mixtures was carried out to evaluate the formation of metastable phases in this immiscible system. The milled powders were characterized for their constitution and structure by X-ray diffraction and transmission electron microscopy methods. It was shown...

  • Foreword. Sakidja, Ridwan // Metallurgical & Materials Transactions. Part A;Mar2014, Vol. 45 Issue 3, p1101 

    An introduction is presented in which the editor discusses various reports within the issue on topics including development of Molybdenum-based alloys, performance of multi-component Niobium-based alloys, and advancements in ultra-high temperature structural alloys.

  • Enhanced high-field current carrying capacities and pinning behavior of NbTi-based superconducting alloys. Wada, H.; Itoh, K.; Tachikawa, K.; Yamada, Y.; Murase, S. // Journal of Applied Physics;5/1/1985, Vol. 57 Issue 9, p4415 

    Presents a study that examined the enhanced high-field current carrying capacities and pinning behavior of Niobium-based alloys. List of alloys used in the study; Device used to examine the microstructural features of alloys; Current density capacity of NbTi superconducting alloys.

  • The strain dependence of the critical properties of Nb...Sn conductors. Haken, B. ten; Godeke, A. // Journal of Applied Physics;3/15/1999, Vol. 85 Issue 6, p3247 

    Presents a study that investigated the critical current of six different Nb3Sn conductors multifilamentary as a function of temperature, magnetic field and strain. Deformation in composite conductors; Nonhdrostatic deformations in Nb3Sn conductors; Theoretical framework of the study.

  • High-Temperature Niobium Alloys. Wojcik[a], C. Craig // Advanced Materials & Processes;Dec98, Vol. 154 Issue 6, p27 

    Provides information about high-temperature niobium alloys. Characteristics of niobium; Production methods; Properties of commercial alloys; Fabrication of parts; High-temperature applications. INSET: Niobium metal.

  • High undercooling of Ni[sub 59]Nb[sub 41] alloy in a containerless electrostatic levitation facility. Robinson, M.B.; Robinson, M. B.; Li, D.; Rogers, J. R.; Rogers, J.R.; Hyers, R. W.; Hyers, R.W.; Savage, L.; Rathz, T. J. // Applied Physics Letters;11/13/2000, Vol. 77 Issue 20 

    Utilizing the containerless electrostatic levitation facility at NASA/MSFC, we were able to undercool the Ni[sub 59]Nb[sub 41] (atomic) alloy by 210 K which was 160° farther than the results of previous flight experiments. Undercoolings were clustered around 200 K during the repeated...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics