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Title: Effect of alloying addition on structure and thermal stability of Ti{sub 40}Al{sub 60} prepared by mechanical alloying

Abstract

Ternary (Ti{sub 40}Al{sub 60}){sub 100{minus}X}M{sub X} (X = 5--15 at.%, M = Mo, Nb) alloys have been prepared by Mechanical Alloying, and the process was monitored by X-ray diffraction technique. The effects of a third additional element have been examined concerning the alloying process, structure and phase thermal stability. As already observed in Ti{sub 40}Al{sub 60} matrix prepared with the same conditions, an amorphous alloy was obtained at the end of the process. A different solubility of Mo (very limited) or Nb (total dissolved) into the matrix was detected. Upon thermal treatment the third element addition caused, in both cases, an increased crystallization temperature with respect to the matrix. The more detailed investigation on niobium addition evidenced the following path for powder crystallization: amorphous-disordered Al-ordered L1{sub 0} phase. The evolution of the long-range order parameter revealed that the disorder {yields} order transition is favored due to the presence of Nb, but independent of its concentration.

Authors:
; ;  [1]
  1. ENEA, Rome (Italy). Casaccia Dept.
Publication Date:
OSTI Identifier:
143145
Resource Type:
Journal Article
Journal Name:
Acta Metallurgica et Materialia
Additional Journal Information:
Journal Volume: 42; Journal Issue: 2; Other Information: PBD: Feb 1994
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TITANIUM ALLOYS; FABRICATION; MICROSTRUCTURE; THERMODYNAMIC PROPERTIES; ALUMINIUM BASE ALLOYS; MOLYBDENUM ALLOYS; NIOBIUM ALLOYS

Citation Formats

Guo, W, Martelli, S, and Magini, M. Effect of alloying addition on structure and thermal stability of Ti{sub 40}Al{sub 60} prepared by mechanical alloying. United States: N. p., 1994. Web. doi:10.1016/0956-7151(94)90496-0.
Guo, W, Martelli, S, & Magini, M. Effect of alloying addition on structure and thermal stability of Ti{sub 40}Al{sub 60} prepared by mechanical alloying. United States. doi:10.1016/0956-7151(94)90496-0.
Guo, W, Martelli, S, and Magini, M. Tue . "Effect of alloying addition on structure and thermal stability of Ti{sub 40}Al{sub 60} prepared by mechanical alloying". United States. doi:10.1016/0956-7151(94)90496-0.
@article{osti_143145,
title = {Effect of alloying addition on structure and thermal stability of Ti{sub 40}Al{sub 60} prepared by mechanical alloying},
author = {Guo, W and Martelli, S and Magini, M},
abstractNote = {Ternary (Ti{sub 40}Al{sub 60}){sub 100{minus}X}M{sub X} (X = 5--15 at.%, M = Mo, Nb) alloys have been prepared by Mechanical Alloying, and the process was monitored by X-ray diffraction technique. The effects of a third additional element have been examined concerning the alloying process, structure and phase thermal stability. As already observed in Ti{sub 40}Al{sub 60} matrix prepared with the same conditions, an amorphous alloy was obtained at the end of the process. A different solubility of Mo (very limited) or Nb (total dissolved) into the matrix was detected. Upon thermal treatment the third element addition caused, in both cases, an increased crystallization temperature with respect to the matrix. The more detailed investigation on niobium addition evidenced the following path for powder crystallization: amorphous-disordered Al-ordered L1{sub 0} phase. The evolution of the long-range order parameter revealed that the disorder {yields} order transition is favored due to the presence of Nb, but independent of its concentration.},
doi = {10.1016/0956-7151(94)90496-0},
journal = {Acta Metallurgica et Materialia},
number = 2,
volume = 42,
place = {United States},
year = {1994},
month = {2}
}