Journal Article

FZJ-2018-03917

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Microstructure and mechanical properties of a directionally solidified Mo-12Hf-24B alloy

Bolbut, V. (Corresponding author) ; Bogomol, I. ; Loboda, P. ; Krüger, M.FZJ*

2018
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2017.11.352

Abstract: In the present paper we report on a new Mo-12Hf-24B (in at. %) alloy which was processed by crucible-free zone melting (ZM) from cold pressed elemental powders. The alloy was solidified using crystallization rates of 90 mm/h, 100 mm/h and 110 mm/h. SEM investigations of the zone molten alloys showed well-aligned arrangements of the microstructural constituents. XRD analyses revealed the following phases: MoSS, Mo2B, HfB and a new phase, which is provisionally indicated as Mo2HfBx. The phases Mo2B and Mo2HfBx have a preferred crystallographic orientation parallel to the growth direction. High temperature compression creep strength at about 1100 °C was evaluated and compared with the commonly used Ni-based superalloys CMSX-4 and CMSX-10 as well as a directionally solidified Mo-Si-B materials. In comparison to the reference alloys, the creep resistance of ZM Mo-Hf-B materials was found to be substantially improved due to the construction and anisotropic arrangement of the incorporated compound phases in these Mo-based alloy.

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Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)

Research Program(s):

1. 111 - Efficient and Flexible Power Plants (POF3-111) (POF3-111)

Appears in the scientific report 2018

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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