Dynamic recovery: The explanation for strain-softening behaviour in Zr–2.3Nb alloy

On the basis of using the variable fractional order to characterize the time-dependent mechanical property, a variable order fractional viscoelastic model is presented to represent the time-dependent evolution of mechanical property including strain softening behaviors. The developed model is applied to analyze the constant strain rate tension and compression tests in ductile metals and soils. It is shown that the model can reasonably characterize the hardening and softening stages of constant strain rate tests and describe the evolution of mechanical property. The time-dependent mechanical property evolution can be split into three parts: in the first stage, the mechanical property is almost invariable, the second phase is a mutation stage, and in the third stage it changes slowly and linearly with strain. The simulated results reveal that the evolution from strain hardening to strain softening is a continuous linear change of mechanical property. Furthermore, it is known that the order obtained through fitting some test data can be greater than 1, which corresponds to strain softening response, while for a long time the order was always assumed to be between 0 and 1.

show abstract

“…Fig. 6 The simulated results of the viscoelastic variable order model for a Zr-2.3Nb alloy [27] . (a):…”

Section: Resultsmentioning

confidence: 99%

“…A series of constant-strain-rate experiments were performed on AZ31 Mg alloy and Zr-2.3Nb alloy by Choi [26] and Yang [27] . It is known from the testing results, shown in Fig.…”

Section: The Evolution Of Mechanical Property In Strain Softening Behmentioning

confidence: 99%

Fractional description of time-dependent mechanical property evolution in materials with strain softening behavior

Meng

Yin

Zhou

et al. 2016

Applied Mathematical Modelling

View full text Add to dashboard Cite

show abstract

“…4,5 Submicrometre grained metals produced by sever plastic deformation have dislocation densities in the order of 10 12 -10 14 m 22 for face centred cubic and body centred cubic crystal structures with high to medium stacking fault energy, [5][6][7][8] which are much lower than those (10 14 -10 15 m 22 ) in deformed coarse grained (Dw1 mm) metals. 8,9 These dislocations are present in the form of individual dislocations or loose dislocation tangles. 2,6,10,11 The low dislocation density and the high volume fraction of grain boundaries in submicrometre grained metals may cause some unexpected annealing behaviours or effects, such as annealing induced hardening in Al, Fe, Ti and Ni.…”

Section: Introductionmentioning

confidence: 99%

Effects of electric pulses on annealing hardening of submicrometre grained copper

Shen

Xie

2015

Materials Science and Technology

View full text Add to dashboard Cite

Effects of electric pulses on the annealing hardening of submicrometre grained (0.1 mm,D,1 mm) Cu processed by heavy cold rolling were investigated. Annealing induced hardening occurred after moderate annealing, which can be attributed to the dislocation source hardening rather than aging hardening, based on the fact that the ultrapure Cu showed higher hardening effect than commercial pure Cu. Electric pulses induced enhancement in the hardening effect for ultrapure Cu, but not for commercial pure Cu. The TEM investigations show that dislocation recovery was enhanced by electric pulses for ultrapure Cu, but not for commercial pure Cu due to the pinning effects of impurity, and negligible growth in both cases due to the short treatment time.

show abstract

Quantitative Assessment of Dynamic Recovery Kinetics in Sn-5Sb Lead-Free Solder Alloy During Hot Working

Vafaeenezhad

Seyedein

Aboutalebi

et al. 2018

Journal of Elec Materi

View full text Add to dashboard Cite

Dynamic recovery: The explanation for strain-softening behaviour in Zr–2.3Nb alloy

Cited by 17 publications

References 20 publications

Fractional description of time-dependent mechanical property evolution in materials with strain softening behavior

Fractional description of time-dependent mechanical property evolution in materials with strain softening behavior

Effects of electric pulses on annealing hardening of submicrometre grained copper

Quantitative Assessment of Dynamic Recovery Kinetics in Sn-5Sb Lead-Free Solder Alloy During Hot Working

Contact Info

Product

Resources

About