Effects of test environment and grain size on the tensile properties of L1 sub 2 -ordered (Co,Fe) sub 3 V alloys

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The influence of test environment, grain size, and heat treatment on the tensile properties and fracture behavior of L1{sub 2}-ordered (Co{sub 78}Fe{sub 22}){sub 3}V and (Co{sub 85}Fe{sub 15}){sub 3}V alloys was studied at room temperature. The tensile ductility depends strongly on test environments; the elongation decreases in the sequence of oxygen, vacuum, air, and distilled water. The loss in elongation is accompanied by a change in fracture mode from transgranular to intergranular. When tested in oxygen or vacuum, (Co{sub 78}Fe{sub 22}){sub 3}V specimens exhibited predominantly transgranular fracture, while (Co{sub 85}Fe{sub 15}){sub 3}V specimens exhibited essentially intergranular fracture. Grain refinement of ... continued below

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Nishimura, C. & Liu, C.T. January 1, 1991.

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The influence of test environment, grain size, and heat treatment on the tensile properties and fracture behavior of L1{sub 2}-ordered (Co{sub 78}Fe{sub 22}){sub 3}V and (Co{sub 85}Fe{sub 15}){sub 3}V alloys was studied at room temperature. The tensile ductility depends strongly on test environments; the elongation decreases in the sequence of oxygen, vacuum, air, and distilled water. The loss in elongation is accompanied by a change in fracture mode from transgranular to intergranular. When tested in oxygen or vacuum, (Co{sub 78}Fe{sub 22}){sub 3}V specimens exhibited predominantly transgranular fracture, while (Co{sub 85}Fe{sub 15}){sub 3}V specimens exhibited essentially intergranular fracture. Grain refinement of (Co{sub 78}Fe{sub 22}){sub 3}V resulted in a ductility improvement in air, while such a beneficial effect of a grain refinement was not observed in (Co{sub 85}Fe{sub 15}){sub 3}V. These results suggest that: (1) (Co,Fe){sub 3}V alloys exhibit a moisture-induced hydrogen embrittlement and (2) grain boundaries are more intrinsically brittle in (Co{sub 85}Fe{sub 15}){sub 3}V than in (Co{sub 78}Fe{sub 22}){sub 3}V. The presence of a brittle hexagonal phase is suggested to be the reason for the observed grain-boundary brittleness in (Co{sub 85}Fe{sub 15}){sub 3}V. 29 refs., 6 figs., 2 tabs.

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Pages: (20 p)

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OSTI; NTIS; GPO Dep.

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  • International conference on high temperature aluminides and intermetallics, San Diego, CA (United States), 17-19 Sep 1991

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  • Other: DE92002332
  • Report No.: CONF-910938-7
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5197066
  • Archival Resource Key: ark:/67531/metadc1059915

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  • January 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 6:16 p.m.

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Nishimura, C. & Liu, C.T. Effects of test environment and grain size on the tensile properties of L1 sub 2 -ordered (Co,Fe) sub 3 V alloys, article, January 1, 1991; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1059915/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.