Functional fatigue during superelastic load cycling of Ti2448 (Ti-24Nb-4Zr-8Sn, wt%)

Church, Nicole; Talbot, CEP; Connor, Leigh D.; Michalik, Š.; Jones, N.G.

doi:10.1016/j.mtla.2023.101719

Cited by 5 publications

(7 citation statements)

References 37 publications

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“…This is consistent with the cyclic degradation of Ti-2448 reported in the literature, which is sometimes referred to as functional fatigue. [2,4] It has been shown that the decay in hysteresis area and σ SIM continues with repeated cycling, for a range of Ti-Nb-based alloys. [5][6][7][8] To elucidate the effect of an RT aging treatment, a second set of 10 cycles to 300 MPa was performed on the same sample following 24 h under ambient conditions.…”

Section: Resultsmentioning

confidence: 99%

“…This is consistent with the cyclic degradation of Ti–2448 reported in the literature, which is sometimes referred to as functional fatigue. [ 2,4 ] It has been shown that the decay in hysteresis area and σ SIM continues with repeated cycling, for a range of Ti–Nb‐based alloys. [ 5–8 ]…”

Section: Resultsmentioning

confidence: 99%

“…[12] It has been suggested that these dislocations, and their associated strain fields, are important for stabilizing the α 00 in the microstructure, manifesting as a decrease in σ SIM and in some cases retaining α 00 on unloading. [2] Similar rationale has been used in the literature for other transforming systems, such as NiTi, which are similarly affected by changes in behavior following repeated cycling. [13] However, more recently, it has been observed that the effects of repeated loading may not be permanent, with recovery in σ SIM reported following heating to temperatures where dislocations become mobile.…”

Section: Introductionmentioning

confidence: 94%

“…[1] In Ti-Nb-based alloys, the mechanical transformation and changes that occur during repeated loading have been widely studied. [2][3][4][5][6][7][8] The α 00 martensite is formed on loading above a critical applied stress, σ SIM , which is acutely sensitive to the alloy composition, and processing history. [9][10][11] During repeated loading, the magnitude of σ SIM decreases, with the most dramatic changes observed within the first few cycles.…”

Section: Introductionmentioning

confidence: 99%

“…[ 12 ] It has been suggested that these dislocations, and their associated strain fields, are important for stabilizing the α″ in the microstructure, manifesting as a decrease in σ SIM and in some cases retaining α″ on unloading. [ 2 ] Similar rationale has been used in the literature for other transforming systems, such as NiTi, which are similarly affected by changes in behavior following repeated cycling. [ 13 ]…”

Section: Introductionmentioning

confidence: 99%

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Understanding the Room Temperature Recovery Behavior in a Ti–24Nb–4Zr–8Sn Superelastic Alloy

Reed,

Church,

Jones

2024

Adv Eng Mater

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Metastable β Ti‐Nb based superelastic alloys have potential uses in the biomedical and aerospace industries due to an attractive combination of properties. However, their mechanical response can be seen to vary with cycling, limiting their uptake. Furthermore, recent studies have also highlighted changes in properties under no applied stress at room temperature, with the reasons for these changes poorly understood. To investigate potential mechanisms for these changes, the superelastic behaviour of Ti‐2448 was studied during mechanical cycling both pre‐ and post‐ room temperature aging treatments. On cycling, there was a reduction in both σSIM and hysteresis area, consistent with behaviour commonly seen in the literature. However, during room temperature aging, there was a rapid, time‐dependant process leading to a partial recovery. In situ diffraction data indicated that this recovery is coincident with a reduction in internal stresses, the potential mechanisms for which are discussed.This article is protected by copyright. All rights reserved.

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