Effects of test environment and grain size on the tensile properties of L12-ordered (Co,Fe)3V alloys

C. Nishimura; C. T. Liu

doi:10.1016/0921-5093(92)90060-E

Author(s)

C. Nishimura
C. T. Liu

Detail(s)

Original language	English
Pages (from-to)	146-152
Journal / Publication	Materials Science and Engineering A
Volume	152
Issue number	1-2
Publication status	Published - 15 May 1992
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1016/0921-5093(92)90060-E Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-0027112346&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(537e35ca-7086-4e5b-aa7d-a2485bfeb877).html

Abstract

The influence of test environment, grain size and heat treatment on the tensile properties and fracture behavior of L1₂-ordered (Co₇₈Fe₂₂)₃V and (Co₈₅Fe₁₅)₃V 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, (Co₇₈Fe₂₂)₃V specimens exhibited predominantly transgranular fracture, while (Co₈₅Fe₁₅)₃V specimens exhibited essentially intergranular fracture. Grain refinement of (Co₇₈Fe₂₂)₃V resulted in a ductility improvement in air, while such a beneficial effect of grain refinement was not observed in (Co₈₅Fe₁₅)₃V. These results suggest that: (1) (Co,Fe)₃V alloys exhibit a moisture-induced hydrogen embrittlement and (2) grain boundaries are more intrinsically brittle in (Co₈₅Fe₁₅)₃V than in (Co₇₈Fe₂₂)₃V. The presence of a brittle hexagonal phase is suggested to be the reason for the observed grain-boundary brittleness in (Co₈₅Fe₁₅)₃V. © 1992.

Citation Format(s)

[ RIS ] [ BibTeX ]

Effects of test environment and grain size on the tensile properties of L1₂-ordered (Co,Fe)₃V alloys. / Nishimura, C.; Liu, C. T.
In: Materials Science and Engineering A, Vol. 152, No. 1-2, 15.05.1992, p. 146-152.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review

Nishimura, C & Liu, CT 1992, 'Effects of test environment and grain size on the tensile properties of L1₂-ordered (Co,Fe)₃V alloys', Materials Science and Engineering A, vol. 152, no. 1-2, pp. 146-152. https://doi.org/10.1016/0921-5093(92)90060-E

Nishimura, C., & Liu, C. T. (1992). Effects of test environment and grain size on the tensile properties of L1₂-ordered (Co,Fe)₃V alloys. Materials Science and Engineering A, 152(1-2), 146-152. https://doi.org/10.1016/0921-5093(92)90060-E

Nishimura C, Liu CT. Effects of test environment and grain size on the tensile properties of L1₂-ordered (Co,Fe)₃V alloys. Materials Science and Engineering A. 1992 May 15;152(1-2):146-152. doi: 10.1016/0921-5093(92)90060-E

Nishimura, C. ; Liu, C. T. / Effects of test environment and grain size on the tensile properties of L1₂-ordered (Co,Fe)₃V alloys. In: Materials Science and Engineering A. 1992 ; Vol. 152, No. 1-2. pp. 146-152.