Synthesis of Nb3Al high temperature intermetallic compound by laser deposition

Jinjiang He, Minlin Zhong, Wenjin Liu, Hongjun Zhang, Ting Huang

Research output: Contribution to conferencePaperpeer-review

1 Citation (Scopus)

Abstract

Refractory intermetallic compound Nb3Al is expected as a candidate for structural materials operated at much higher temperatures compared to conventional Ni superalloys. This paper presents research work on laser deposition of a powder blend of Nb, Ti, Al pure elements to form Nb 3Al intermetallic compound. The research focuses on an alloy composition of Nb-12Ti-22Al (at.%). The fine δ-Nb 3Al/β-Nbss intermetallic compound with a composition close to the atom ratios of the elemental powder blend was obtained by laser deposition in an argon atmosphere chamber. The microstructure characterization and phase identification were analyzed by XRD, SEM and TEM. The fine δ/β compound has an average microhardness up to HV0.21022. Although Nb3Al has a negative formation enthalpy, high laser energy density is needed for Nb3Al formation by peritectic reaction. There is a critical crack-free height in laser deposition of Nb3Al under appropriate processing parameters. Beyond the height, the sample cracks due to residual tensile stress induced during laser deposition.

Original languageEnglish
Pages585-590
Number of pages6
DOIs
Publication statusPublished - 2005
Externally publishedYes
Event24th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2005 - Miami, FL, United States
Duration: 2005 Oct 312005 Nov 3

Other

Other24th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2005
Country/TerritoryUnited States
CityMiami, FL
Period05/10/3105/11/3

ASJC Scopus subject areas

  • Engineering(all)

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