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A new high-strength spinodal alloy

  • James A. Hanna (a1), Ian Baker (a1), Markus W. Wittmann (a1) and Paul R. Munroe (a2)
  • DOI: http://dx.doi.org/10.1557/JMR.2005.0136
  • Published online: 01 April 2005
Abstract

Preliminary investigations of a new high-strength alloy of composition Fe30Ni20Mn25Al25 (at.%) are described in this paper. The as-cast alloy consisted of a periodic two-phase microstructure of interconnected, ∼50-nm-wide rods with fully coherent {100} interfaces, strongly suggestive of formation by a B2 to [(B2 + body-centered cubic (bcc)] spinodal decomposition. The (Ni,Al)-rich B2 and (Fe,Mn)-rich bcc phases differed in lattice parameter by <0.5%. Hardness and yield strength of the as-cast alloy were found to be approximately 500 VPN and 1500 MPa, respectively, and increased by more than 50% after annealing at 550 °C for several days. (Fe,Mn)-rich precipitates with a β–Mn structure were observed in the annealed material.

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a) Address all correspondence to this author. e-mail: James.A.Hanna@Dartmouth.edu
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10.J. Singh and C. Wayman : Age-hardening characteristics of a martensitic Fe–Ni–Mn alloy. Mater. Sci. Eng. 94, 233 (1987).

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15.I. Baker , P. Nagpal , F. Liu and P. Munroe : The effect of grain size on the yield strength of FeAl and NiAl. Acta Metall. Mater. 39(7), 1637 (1991).

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Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
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