scholarly journals A Combined Precipitation, Yield Stress, and Work Hardening Model for Al-Mg-Si Alloys Incorporating the Effects of Strain Rate and Temperature

2018 ◽  
Vol 49 (8) ◽  
pp. 3592-3609 ◽  
Author(s):  
Ole Runar Myhr ◽  
Odd Sture Hopperstad ◽  
Tore Børvik
Keyword(s):  
Strain Rate ◽  
Yield Stress ◽  
Work Hardening ◽  
Hardening Model ◽  
Work Hardening Model

A work-hardening model of the lower yield strength of discontinuously yielding alloys: Ni3Al and mild steel

1989 ◽  
Vol 4 (3) ◽  
pp. 470-472 ◽  
Author(s):  
E. M. Schulson
Keyword(s):  
Grain Size ◽  
Yield Strength ◽  
Mild Steel ◽  
Work Hardening ◽  
Lower Yield ◽  
Hardening Model ◽  
Lower Yield Strength ◽  
Work Hardening Model ◽  
Lüders Bands

The lower yield strengths of Ni3Al and mild steel and their respective relationships to (grain size)−0.8 and (grain size)−0.5 are explained in terms of work hardening within Lüders bands.

The Effects of Interstitial Content and Annealing on the Flow and Fracture behavior of Polycrystalline ÿ-NiAl

1994 ◽  
Vol 364 ◽  
Author(s):  
M. L. Weaver ◽  
V. Levit ◽  
M. J. Kaufman ◽  
R. D. Noebe
Keyword(s):  
Strain Rate ◽  
Yield Stress ◽  
Work Hardening ◽  
Strain Aging ◽  
Fracture Behavior ◽  
Rate Sensitivity ◽  
Dynamic Strain ◽  
Aging Behavior ◽  
Aging Theories ◽  
Tenfold Increase

AbstractThe strain aging behavior of three polycrystalline NiAl alloys has been investigated at temperatures between 300 and 1200 K. Yield stress plateaus, yield stress transients upon a tenfold increase in strain rate, work hardening peaks, and dips in the strain rate sensitivity (SRS) have been observed between 700 and 800 K. These observations are indicative of dynamic strain aging (DSA) and are discussed in terms of conventional strain aging theories.

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 Behaviour of Heat-Treatable Al-Mg-Si-Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 1901-1906 ◽  
Author(s):  
Jesper Friis ◽  
Bjørn Holmedal ◽  
Øyvind Ryen ◽  
Erik Nes ◽  
Ole R. Myhr ◽  
...  
Keyword(s):  
Field Theory ◽  
Work Hardening ◽  
Metal Matrix ◽  
Mean Field Theory ◽  
Mean Field ◽  
Heat Treatments ◽  
Stress Strain ◽  
Hardening Model ◽  
Work Hardening Model ◽  
Strain Responses

The work hardening of alloys hardened by precipitate heat treatments depends on the distribution of the precipitate sizes and the solute level left in the metal matrix. A mean field theory for precipitation is first applied for the ageing and subsequently it is coupled to a work hardening model to study the stress-strain responses of age hardened conditions of AA6xxx alloys. The predictions are compared to mechanical experiments and to TEM characterisations.

Modelling Nucleation of Recrystallisation in Aluminium Alloys

2007 ◽  
Vol 550 ◽  
pp. 85-94 ◽  
Author(s):  
C. Schäfer ◽  
Mischa Crumbach ◽  
Günter Gottstein
Keyword(s):  
Growth Model ◽  
Work Hardening ◽  
Aluminium Alloys ◽  
Deformation Texture ◽  
Process Modelling ◽  
Hardening Model ◽  
Texture Model ◽  
Nucleation Mechanisms ◽  
Work Hardening Model

The predictions from a grain cluster deformation texture model, GIA, are utilized to study the nucleation texture of recrystallisation of aluminium alloys. In combination with a dislocation based work hardening model, the propensity of specific grains in their granular environment for select nucleation mechanisms is investigated. Quantitative criteria for the nucleation events can be formulated. The results can be fed into a growth model of recrystallisation to predict recrystallisation textures and lend themselves to through-process modelling.

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