SYMPOSIA PAPER Published: 01 January 1984
STP30214S

Effects of Deformation Twinning on the Stress-Strain Curves of Low Stacking Fault Energy Face-Centered Cubic Alloys

Source

A quantitative metallographic study of the effects of mechanical twinning on the uniaxial stress-strain curves of Cu-3.1Sn, Cu-4.9Sn, Cu-30Zn, and Co-40Ni has shown that twinning produces identifiable deformation stages in these alloys. These deformation stages are (1) an interval without twinning, (2) twinning on a single crystallographic plane within a grain, (3) twinning on intersecting twinning planes, and (4) dynamic recovery. In Stage 2, in which twins apparently form on the primary slip plane, twinning decreases the work hardening rate, whereas in Stage 3 the development of intersecting twin arrays increases the work hardening rate by progressively decreasing the effective grain size. The increased work hardening in Stage 3 accounts for the unusually high ductility of those alloys that twin heavily. The strength of the effects of the twinning on the stress-strain curve increases with increasing solute concentration and decreasing temperature.

Author Information

Krishnamurthy, S
Air Force, Wright Aeronautical Laboratories, Wright-Patterson Air Force Base, Dayton, Ohio
Qian, K-W
Fuzhou University, Fuzhou, Fujian, People's Republic of China
Reed-Hill, RE
University of Florida, Gainesville, Fla.
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Details
Developed by Committee: E04
Pages: 41–64
DOI: 10.1520/STP30214S
ISBN-EB: 978-0-8031-4905-2
ISBN-13: 978-0-8031-0220-0