ON THE MECHANISM OF WORK HARDENING IN f.c.c. METALS

1967 ◽  
Vol 45 (2) ◽  
pp. 631-661 ◽  
Author(s):  
Helmut Kronmüller
Keyword(s):  
Flow Stress ◽  
Single Crystals ◽  
Long Range ◽  
Work Hardening ◽  
Slip Line ◽  
Elastic Interaction ◽  
Stress Fields ◽  
Internal Stresses ◽  
Transmission Microscopy ◽  
Magnetic Methods

A review of the methods applied for the investigation of long-range stresses in deformed single crystals is given. The results found by magnetic methods are discussed in some detail; slip-line data and transmission microscopy are mentioned briefly. The effect of internal stresses on the flow stress is discussed and it is shown that the elastic interaction between the primary dislocations determines the flow stress almost completely. Secondary dislocations are found to be incapable of relaxing the stress fields of the primary dislocations appreciably.

Strain Rate Dependence of the Flow Stress and Work-Hardening of Single Crystals of NI3(Al,Hf)B

1994 ◽  
Vol 364 ◽  
Author(s):  
S. S. Ezz ◽  
Y. Q. Sun ◽  
P. B. Hirsch
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Yield Stress ◽  
Strain Rate Sensitivity ◽  
Work Hardening ◽  
Room Temperature ◽  
Rate Sensitivity ◽  
Controlling Mechanism

AbstractThe strain rate sensitivity ß of the flow stress τ is associated with workhardening and β=(δτ/δln ε) is proportional to the workhardening increment τh = τ - τy, where τy is the strain rate independent yield stress. The temperature dependence of β/τh reflects changes in the rate controlling mechanism. At intermediate and high temperatures, the hardening correlates with the density of [101] dislocations on (010). The nature of the local obstacles at room temperature is not established.

WORK HARDENING IN EASY GLIDE

1967 ◽  
Vol 45 (2) ◽  
pp. 765-775 ◽  
Author(s):  
P. M. Hazzledine
Keyword(s):  
Flow Stress ◽  
Slip Plane ◽  
Edge Dislocation ◽  
Work Hardening ◽  
Slip Line ◽  
Opposite Sign ◽  
Experimental Measurements ◽  
Line Pattern ◽  
Burgers Vector ◽  
Single Slip

A theory of single-slip work hardening is proposed, in which the flow stress is controlled by the stress required for one group of dislocations to pass another group with the same Burgers vector but with opposite sign on a parallel slip plane. The strain and the details of the slip-line pattern are calculated as a function of stress from the known properties of edge-dislocation multipoles. The predictions of the theory are compared with experimental measurements on Mg and are found to be in fair agreement.The theory presented is a highly simplified first version, and various possible developments of it are discussed.

Work hardening and flow stress of ultrapure molybdenum single crystals

2001 ◽  
Vol 319-321 ◽  
pp. 233-236 ◽  
Author(s):  
L Hollang ◽  
D Brunner ◽  
A Seeger
Keyword(s):  
Flow Stress ◽  
Single Crystals ◽  
Work Hardening
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