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

被引：10
作者：
Church, N. L. [1 ]
Talbot, C. E. P. [1 ]
Connor, L. D. [2 ]
Michalik, S. [2 ]
Jones, N. G. [1 ]
机构：
[1] Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England
[2] Harwell Sci & Innovat Campus, Diamond Light Source, Didcot OX11 0DE, England
来源：
MATERIALIA | 2023年 / 28卷
基金：
英国工程与自然科学研究理事会;
关键词：
Synchrotron diffraction; Ti-Nb; Martensitic transformation; Mechanical properties; Cyclic loading; SHAPE-MEMORY ALLOYS; TI-NB-ZR; TITANIUM-ALLOY; BEHAVIOR; TRANSFORMATION; TEMPERATURE; STRAIN; ENERGY;
D O I：
10.1016/j.mtla.2023.101719
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Superelastic alloys based on Ti-Nb have potential in the aerospace sector for vibration damping applications, due to their wide mechanical hysteresis and tuneable properties. However, their uptake is currently limited by functional fatigue, whereby a degradation in properties is seen on cyclic loading. To understand the mechanisms that underpin this change in behaviour, a combination of ex situ and in situ testing was used to characterise the evolution of the mechanical response in a commercial Ti-Nb based alloy. It was found that the behaviour of these materials changes via a two-step mechanism, driven by the accumulation of transformation related defects and their associated stress fields. This understanding rationalises many discrepancies within the literature and highlights how the overall shape of the load response of these alloys is dominated by changes occurring only in specific regions of the material.
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页数：13
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