TY - JOUR

T1 - Influence of Decreased Temperature of Tensile Testing on the Annealing-Induced Hardening and Deformation-Induced Softening Effects in Ultrafine-Grained Al–0.4Zr Alloy

AU - Орлова, Татьяна Сергеевна

AU - Мавлютов, Айдар Марселевич

AU - Мурашкин, Максим Юрьевич

AU - Еникеев, Нариман Айратович

AU - Евстифеев, Алексей Дмитриевич

AU - Садыков, Динислам

AU - Гуткин, Михаил

N1 - Publisher Copyright: © 2022 by the authors.

PY - 2022/12

Y1 - 2022/12

N2 - The influence of decreased temperature of tensile testing on annealing-induced hardening (AIH) and deformation-induced softening (DIS) effects has been studied in an ultrafine-grained (UFG) Al–Zr alloy produced by high-pressure torsion. We show that the UFG Al–Zr alloy demonstrates a DIS effect accompanied by a substantial increase in the elongation to failure δ (up to δ ≈ 30%) depending on the value of additional straining. Both the AIH and DIS effects weaken with a decrease in the tensile test temperature. The critical deformation temperatures were revealed at which the AIH and DIS effects are suppressed. The activation energy Q of plastic flow has been estimated for the UFG Al–Zr alloy in the as-processed, subsequently annealed and additionally strained states. It was shown that the annealing decreases the Q-value from ~80 kJ/mol to 23–28 kJ/mol, while the subsequent additional straining restores the initial Q-value. Alloying with Zr results in the expansion of the temperature range of the AIH effect manifestation to lower temperatures and results in the change in the Q-value in all of the studied states compared to the HPT-processed Al. The obtained Q-values and underlying flow mechanisms are discussed in correlation with specific microstructural features and in comparison to the UFG Al.

AB - The influence of decreased temperature of tensile testing on annealing-induced hardening (AIH) and deformation-induced softening (DIS) effects has been studied in an ultrafine-grained (UFG) Al–Zr alloy produced by high-pressure torsion. We show that the UFG Al–Zr alloy demonstrates a DIS effect accompanied by a substantial increase in the elongation to failure δ (up to δ ≈ 30%) depending on the value of additional straining. Both the AIH and DIS effects weaken with a decrease in the tensile test temperature. The critical deformation temperatures were revealed at which the AIH and DIS effects are suppressed. The activation energy Q of plastic flow has been estimated for the UFG Al–Zr alloy in the as-processed, subsequently annealed and additionally strained states. It was shown that the annealing decreases the Q-value from ~80 kJ/mol to 23–28 kJ/mol, while the subsequent additional straining restores the initial Q-value. Alloying with Zr results in the expansion of the temperature range of the AIH effect manifestation to lower temperatures and results in the change in the Q-value in all of the studied states compared to the HPT-processed Al. The obtained Q-values and underlying flow mechanisms are discussed in correlation with specific microstructural features and in comparison to the UFG Al.

KW - annealing-induced hardening

KW - deformation-induced softening

KW - low temperatures

KW - mechanical properties

KW - ultrafine-grained aluminum-zirconium alloys

UR - http://www.scopus.com/inward/record.url?scp=85143761272&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/c27f0701-1a75-3449-95bb-0b9563e827f3/

U2 - 10.3390/ma15238429

DO - 10.3390/ma15238429

M3 - Article

C2 - 36499928

VL - 15

JO - Materials

JF - Materials

SN - 1996-1944

IS - 23

M1 - 8429

ER -