Brittle fracture in 50Mo-50Re alloys during slow strain rate tensile testing

Jianhui Xu; Edward A. Kenik; Tongguang Zhai

doi:10.1080/14786430802216366

Brittle fracture in 50Mo-50Re alloys during slow strain rate tensile testing

Jianhui Xu, Edward A. Kenik, Tongguang Zhai

Chemical and Materials Engineering

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Tensile tests were conducted on 50 wt% Mo-50 wt% Re alloys in both fully recrystallized and recovery heat-treated conditions at a low strain rate of 10-6 s-1 and room temperature in air. It was found that both material conditions exhibited predominantly cleavage fracture with significant intergranular secondary cracking, compared to the predominantly ductile fracture found in the alloys at a higher strain rate. Cracks were often initiated at grain boundary triple junctions at the low strain rate. Electron backscatter diffraction (EBSD) measurements revealed significantly high misorientation gradients (i.e. highly localized change in orientation) at grain boundaries, especially in the vicinity of some grain boundary triple junctions in the deformed alloys. Transmission electron microscopy (TEM) results verified the existence of significant misorientations near grain boundaries in these alloys. Stress-assisted dynamic embrittlement, possibly due to trace interstitials, was the possible cause of brittle fracture in the 50Mo-50Re alloys at the low strain rate.

Original language	English
Pages (from-to)	1543-1553
Number of pages	11
Journal	Philosophical Magazine
Volume	88
Issue number	10
DOIs	https://doi.org/10.1080/14786430802216366
State	Published - Apr 2008

Bibliographical note

Funding Information:
This research was supported through a NSF CAREER AWARD (DMR-0645246). The TEM work reported in this paper was conducted as part of the Oak Ridge National Laboratory’s SHaRE User Facility, which is sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Industrial Technologies Program, Industrial Materials for the Future and the Division of Materials Sciences and Engineering, under contract DE-AC05-00OR22725 with U.T. Battelle, LLC. The authors would like to thank Michael Effgen from Semicon Associates for providing the 50Mo–50Re alloys used in this work.

Keywords

Brittle fracture
Dynamic embrittlement
Misorientation
Mo-Re alloy
Strain-rate dependence

ASJC Scopus subject areas

Condensed Matter Physics

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10.1080/14786430802216366

Cite this

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title = "Brittle fracture in 50Mo-50Re alloys during slow strain rate tensile testing",

abstract = "Tensile tests were conducted on 50 wt% Mo-50 wt% Re alloys in both fully recrystallized and recovery heat-treated conditions at a low strain rate of 10-6 s-1 and room temperature in air. It was found that both material conditions exhibited predominantly cleavage fracture with significant intergranular secondary cracking, compared to the predominantly ductile fracture found in the alloys at a higher strain rate. Cracks were often initiated at grain boundary triple junctions at the low strain rate. Electron backscatter diffraction (EBSD) measurements revealed significantly high misorientation gradients (i.e. highly localized change in orientation) at grain boundaries, especially in the vicinity of some grain boundary triple junctions in the deformed alloys. Transmission electron microscopy (TEM) results verified the existence of significant misorientations near grain boundaries in these alloys. Stress-assisted dynamic embrittlement, possibly due to trace interstitials, was the possible cause of brittle fracture in the 50Mo-50Re alloys at the low strain rate.",

keywords = "Brittle fracture, Dynamic embrittlement, Misorientation, Mo-Re alloy, Strain-rate dependence",

author = "Jianhui Xu and Kenik, {Edward A.} and Tongguang Zhai",

note = "Funding Information: This research was supported through a NSF CAREER AWARD (DMR-0645246). The TEM work reported in this paper was conducted as part of the Oak Ridge National Laboratory{\textquoteright}s SHaRE User Facility, which is sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Industrial Technologies Program, Industrial Materials for the Future and the Division of Materials Sciences and Engineering, under contract DE-AC05-00OR22725 with U.T. Battelle, LLC. The authors would like to thank Michael Effgen from Semicon Associates for providing the 50Mo–50Re alloys used in this work.",

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AU - Kenik, Edward A.

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PY - 2008/4

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N2 - Tensile tests were conducted on 50 wt% Mo-50 wt% Re alloys in both fully recrystallized and recovery heat-treated conditions at a low strain rate of 10-6 s-1 and room temperature in air. It was found that both material conditions exhibited predominantly cleavage fracture with significant intergranular secondary cracking, compared to the predominantly ductile fracture found in the alloys at a higher strain rate. Cracks were often initiated at grain boundary triple junctions at the low strain rate. Electron backscatter diffraction (EBSD) measurements revealed significantly high misorientation gradients (i.e. highly localized change in orientation) at grain boundaries, especially in the vicinity of some grain boundary triple junctions in the deformed alloys. Transmission electron microscopy (TEM) results verified the existence of significant misorientations near grain boundaries in these alloys. Stress-assisted dynamic embrittlement, possibly due to trace interstitials, was the possible cause of brittle fracture in the 50Mo-50Re alloys at the low strain rate.

AB - Tensile tests were conducted on 50 wt% Mo-50 wt% Re alloys in both fully recrystallized and recovery heat-treated conditions at a low strain rate of 10-6 s-1 and room temperature in air. It was found that both material conditions exhibited predominantly cleavage fracture with significant intergranular secondary cracking, compared to the predominantly ductile fracture found in the alloys at a higher strain rate. Cracks were often initiated at grain boundary triple junctions at the low strain rate. Electron backscatter diffraction (EBSD) measurements revealed significantly high misorientation gradients (i.e. highly localized change in orientation) at grain boundaries, especially in the vicinity of some grain boundary triple junctions in the deformed alloys. Transmission electron microscopy (TEM) results verified the existence of significant misorientations near grain boundaries in these alloys. Stress-assisted dynamic embrittlement, possibly due to trace interstitials, was the possible cause of brittle fracture in the 50Mo-50Re alloys at the low strain rate.

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KW - Misorientation

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KW - Strain-rate dependence

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Brittle fracture in 50Mo-50Re alloys during slow strain rate tensile testing

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Bibliographical note

Keywords

ASJC Scopus subject areas

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