High Temperature Deformation Behavior and Microstructural Evolution of Nb-10Hf-1Ti Alloy Produced by Vacuum Arc Melting

Momeni, Hossein; Ranjbar Motlagh, sasan

doi:10.22068/ijmse.3590

Volume 21, Issue 3 (September 2024) IJMSE 2024, 21(3): 1-9 | Back to browse issues page

‎ 10.22068/ijmse.3590

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Momeni H, Ranjbar Motlagh S. High Temperature Deformation Behavior and Microstructural Evolution of Nb-10Hf-1Ti Alloy Produced by Vacuum Arc Melting. IJMSE 2024; 21 (3) :1-9
URL: http://ijmse.iust.ac.ir/article-1-3590-en.html

High Temperature Deformation Behavior and Microstructural Evolution of Nb-10Hf-1Ti Alloy Produced by Vacuum Arc Melting

Hossein Momeni

, Sasan Ranjbar Motlagh

Abstract: (4554 Views)

The present work deals with the hot deformation behavior of commercial Nb alloy C-103 and its microstructure evolution during uniaxial compression tests in the temperature range of 700-1100 °C and the strain rate range of 0.001-0.4 s^-1. Strain rate sensitivity, calculated from the compression tests data, was almost constant and showed a negative value in the temperature range of 700-900 °C but increased significantly beyond 900 °C. Dynamic strain aging was found to have a predominant effect up to 900 °C, beyond which dynamic recovery and oxidation influenced the compressive properties. The microstructure of the deformed samples showed indications of dynamic recrystallization within the high strain rate sensitivity domain and features of flow instability in the regime of low strain rate sensitivity. The 950–1000 °C temperature range and strain rate range of 0.001-0.1 s-1 were suggested as suitable hot deformation conditions. The constitutive equation was established to describe the alloy's flow behavior, and the average activation energy for plastic flow was calculated to be 267 kJ/mol.

Keywords: Niobium alloy, Hot deformation, Strain rate sensitivity, Dynamic recrystallization, Constitutive equation

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