Cross-slip phenomena in L1[sub 2] long range ordered alloys

Journal Article · Sun May 01 04:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90379-4· OSTI ID:5153351

Korner, A ^[1]

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1. Univ. Wien (Australia). Inst. fuer Festkoerperphysik

Cross-slip of screw superlattice dislocations in long range ordered alloys is investigated by using the weak-beam darkfield imaging method. A Ni[sub 3] (Al,Ti) alloy and Ni[sub 3]Fe were selected. The former alloy belongs to the category whose representatives are ordered up to the melting temperature; the latter alloy has an order/disorder transition at 503 C. Ni[sub 3](Al,Ti) exhibits an anomalous increase of the yield stress with increasing temperature. Cross slip of screw superlattice dislocations onto cube planes is a characteristic feature which was found to occur with high frequency at the temperature of the onset of the anomaly. Screws dissociated on cube planes are predominantly observed. In the temperature regime below where the flow stress slightly decreases with increasing temperature octahedral cross-slip was found. In Ni[sub 3]FE there is almost no temperature dependence of the flow stress. Octahedral cross-slip is frequently observed but cube cross-slip is rarely found. The edge superlattice dislocations are fourfold dissociated.

• OSTI ID: 5153351
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:5; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DISLOCATIONS
EXPERIMENTAL DATA
INFORMATION
INTERMETALLIC COMPOUNDS
IRON ALLOYS
LINE DEFECTS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL DATA
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
SCREW DISLOCATIONS
SLIP
TITANIUM ALLOYS