THE EFFECT OF ATOMIC ORDER ON ENVIRONMENTAL EMBRITTLEMENT OF AN FE3AL-BASED ALLOY

Authors
SU JQ GAO SJ ZHANG SS GUO JT HU ZQ
Citation
Jq. Su et al., THE EFFECT OF ATOMIC ORDER ON ENVIRONMENTAL EMBRITTLEMENT OF AN FE3AL-BASED ALLOY, Materials letters, 31(3-6), 1997, pp. 227-231
Citations number
27
Categorie Soggetti
Material Science","Physics, Applied
Journal title
Materials letters → ACNP
ISSN journal
0167577X
Volume
31
Issue
3-6
Year of publication
1997
Pages
227 - 231
Database
ISI
SICI code
0167-577X(1997)31:3-6<227:TEOAOO>2.0.ZU;2-J
Abstract
The effect of atomic order on environmental embrittlement of an Fe3Al- based alloy was studied. The ordered B2 and DO3 structures are much mo re susceptible to the test environments (air versus vacuum) than the d isordered structure. The embrittlement index, I, of B-2, DO3 and disor dered structures is 62.1%, 62.5% and 21.7%, respectively. The disorder ed Fe-Al alloy showed the transgranular cleavage fracture mode wheneve r tested in vacuum or in air. A mixed intergranular/transgranular clea vage fracture mode was observed for both ordered alloys tested in vacu um. When tested in air, the B2 alloy continued to fracture via the mix ed mode, while the DO3 alloy exhibited mainly transgranular cleavage f racture.