The deformation behavior of the L1{sub 0} ordered FePd alloy

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(96)00453-8· OSTI ID:460420

Rao, M; Soffa, W A ^[1]

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1. Univ. of Pittsburgh, PA (United States). Dept. of Materials Science and Engineering

The ordered equiatomic L1{sub 0} alloys such as CuAu, CoPt, FePt and FePd undergo a cubic (disordered; fcc) {yields} tetragonal (ordered; L1{sub 0}) transformation upon cooling and generally develop a so-called polytwinned structure. This polysynthetically twinned or lamellar microstructure is shown developed in an equiatomic FePd alloy. The microstructure consists of an aggregate of twin lamellae conjugated along the {l_brace}110{r_brace} planes of the parent cubic phase. The so-called c-domains or transformation twins produce a modulated structure whereby the c-axis of the L1{sub 0} tetragonal phase changes by approximately 90{degree} across the twin interfaces. These microlaminated structures introduce a novel constraint on plastic flow and are expected to have a major influence on the plasticity and fracture behavior. The transfer of shear across the twin interfaces through successive twin lamellae is an interesting problem from both a continuum and mechanistic point of view.

• Sponsoring Organization: USDOE, Washington, DC (United States); Pittsburgh Univ., PA (United States)
• OSTI ID: 460420
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 36; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
INTERFACES
INTERMETALLIC COMPOUNDS
IRON ALLOYS
LAMELLAE
MICROSTRUCTURE
PALLADIUM ALLOYS
TWINNING
YIELD STRENGTH