Dislocation and Grain Size Roles in Physical Mesomechanics

Armstrong, Ronald W.

doi:10.1134/s1029959921040068

Cited by 3 publications

(1 citation statement)

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“…Consequently, similar structures are formed in the strain range from 1.84 to 9.55, for which σ 0 and k are the same. In [21][22][23][24], it is believed that the Hall-Patch relation is satisfied not only when the yield stress is reached but also at other strain values (up to the ultimate tensile strength). Figure 8 shows that the dependence of σ UTS on d −1/2 is also linear in the strain range e from 1.84 to 9.55.…”

Section: Discussionmentioning

confidence: 99%

Mechanical Properties of the Ti49.8Ni50.2 Alloy after Multi-Axial Forging at 573 K

Лотков

Кашин

Гришков

et al. 2022

Metals

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The mechanical properties of Ti49.8Ni50.2 (at %) alloy under tension at room temperature are studied in dependence on the true strain (e = 1.84–9.55) specified during isothermal multi-axial forging (abc-pressing). It was found that the stress at the beginning of the pseudoyield plateau does not depend on the value of the true abc-strain. It was found that after abs-pressing, already at a true strain e = 1.84, the yield stress σy was 900 ± 25 MPa, which is more than twice as high as compared to σy in the initial state of the specimens. With a further increase in the abc-strain, the yield stress continues to increase slightly and reaches 1000 ± 25 MPa at e = 9.55. In this case, the ultimate tensile strength of the samples increases by about 15%. The strain-hardening coefficient ϴ = dσ/dε at the III (linear) stage of the σ(ε) curve has a similar dependence on e. It is shown that after abc-pressing with e from 1.84 to 9.55, the yield stress and ultimate tensile increase linearly with increasing d−1/2 in accordance with the Hall–Petch relation, where d is the average grain–subgrain size.

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Section: Discussionmentioning

confidence: 99%