Dislocation substructures and nonproportional hardening. [TEM observations under tension-torsion cyclic loading]

Journal Article · Mon Oct 01 00:00:00 EDT 1990 · Journal of Engineering Materials and Technology; (United States)

DOI:https://doi.org/10.1115/1.2903357· OSTI ID:7019398

Doong, Shiinghwa; Socie, D F; Robertson, I M ^[1]

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1. Univ. of Illinois, Urbana (United States)

The dislocation substructures created in 1100 aluminum, OFHC copper, and type 304 and 310 stainless steels by in-phase (proportional) and 90 deg out-of-phase (nonproportional) tension-torsion cyclic loading were examined with a transmission-electron microscope. Multislip structures (cells and subgrains) are observed in aluminum under both in-phase and 90 deg out-of-phase tension-torsion loading. For copper and stainless steel, single-slip structures (planar dislocations, matrix veins, and ladders) are observed after proportional loading, whereas multislip structures (cells and labyrinths) are observed after nonproportional loading. The increased cyclic hardening of copper and stainless steels under nonproportional loading is attributed to the change of dislocation substructures. Based on these observations, formulation of a nonproportionality parameter for constitutive modeling is discussed.

• DOE Contract Number: AC02-76ER01198
• OSTI ID: 7019398
• Journal Information: Journal of Engineering Materials and Technology; (United States), Vol. 112; ISSN 0094-4289
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
DISLOCATIONS
COPPER
STAINLESS STEEL-304
STAINLESS STEEL-310
DEFORMATION
DYNAMIC LOADS
HARDENING
ALLOYS
AUSTENITIC STEELS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MATERIALS
METALS
NICKEL ALLOYS
STAINLESS STEELS
STEEL-CR19NI10
STEEL-CR25NI20
STEELS
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties