Recovery of microindents in a nickel–titanium shape-memory alloy: A “self-healing” effect

Ni, Wangyang; Cheng, Yang-Tse; Grummon, David S.
May 2002
Applied Physics Letters;5/6/2002, Vol. 80 Issue 18, p3310
Academic Journal
The thermally induced recovery of microscopic deformation in a nickel-titanium shape-memory alloy was examined. Surface deformation was simulated by indenting the alloy in the martensite phase at room temperature using both spherical and pyramidal indenters. We show that deformation in spherical microindents can be almost completely reversed by moderate heating. Partial recovery was observed for pyramidal impressions formed by a Vickers indenter and the recovery ratio was independent of the indentation depth. The observations were rationalized using the concept of representative strain and maximum stress under the spherical and pyramidal indenters.


Related Articles

  • Behavior of the shape memory alloy NiTi during one-dimensional shock loading. Millett, J. C. F.; Bourne, N. K.; Gray, G. T. // Journal of Applied Physics;9/15/2002, Vol. 92 Issue 6, p3107 

    The response of alloys based on the intermetallic compound NiTi to high-strain-rate and shock loading conditions has recently attracted attention. In particular, similarities between it, and other shape memory materials such as the alloy U-6%Nb in the propagation of the plastic wave in Taylor...

  • Hydrothermal Growth Mechanism of Controllable Hydrophilic Titanate Nanostructures on Medical NiTi Shape Memory Alloy. Rao, X.; Chu, C.; Chung, C.; Chu, Paul // Journal of Materials Engineering & Performance;Dec2012, Vol. 21 Issue 12, p2600 

    Different titanate nanostructures were deposited on the surface of NiTi by a hydrothermal process using 5-20 M NaOH at 90-150 °C for 6-72 h. SEM and XRD analyses revealed that different structures such as nanoflakes, nanorods, nanograins, nanofibers, microwhiskers, etc., were formed. As the...

  • Thermopower behavior for the shape memory alloy NiTi. Lee, J. Y.; McIntosh, G. C.; Kaiser, A. B.; Park, Y. W.; Kaack, M.; Pelzl, J.; Kim, Chul Koo; Nahm, Kyun // Journal of Applied Physics;6/1/2001, Vol. 89 Issue 11, p6223 

    We report thermopower measurements for the nickel titanium shape memory alloy Ni[sub 0.507]Ti[sub 0.493]. Our measurements reveal abrupt changes in the temperature dependence of thermopower, which correlate well with the structural phase transition between the austenitic and martensitic phases....

  • Cheating the quake.  // Design Engineering;Nov99, p10 

    Informs on a European Union project at the Basilica of St. Francis of Assisi which could offer a way to protect buildings and people from future earthquakes. Italian engineering company FIP Industriale's use of shape memory alloys to devise a solution; Installation of bundles of wires made of...

  • The optimization of annealing and cold-drawing in the manufacture of the Ni-Ti shape memory alloy ultra-thin wire. Lei, Xu; Rui, Wang; Yong, Liu // International Journal of Advanced Manufacturing Technology;Aug2011, Vol. 55 Issue 9-12, p905 

    In this paper, the mechanical properties of the Ni-50.5 at.%-Ti alloy super-elastic wires manufactured by a conditioned multi-passed process of annealing and cold-drawing have been studied. The annealing temperature of 450~800°C, time of 20 min~3 h and the cold-drawing amount of 6.9%~39% were...

  • The Alloy That Remembers.  // Time;9/13/1968, Vol. 92 Issue 11, p64 

    The article focuses on the physical properties of 55-Nitinol, a nickel-titanium alloy discovered by metallurgist William Buehler. It mentions the laboratory tests done by physicist Frederick Wang and Buehler in which Nitinol was subjected to high temperature, crushed, and heated again. It...

  • Experimental Characterization and Numerical Modelling of a Pseudo Elastic Behaviour of Ti-Ni Shape Memory Alloys. Sahli, M. L.; Necib, B. // International Review of Mechanical Engineering;Sep2008, Vol. 2 Issue 5, p741 

    The aim of this work is to effect experimental investigations comparatively to numerical simulations on superelastic shape-memory alloys (SMAs) and specially its importance when this latter is reinforced by smart composite materials. The obtained material is then a special kind of "smart...

  • MICROSTRUCTURES AND MECHANICAL PROPERTIES OF SINTERED AND EXTRUDED TiNi SHAPE-MEMORY ALLOYS USING PREALLOYED POWDER WITH ADDITIONS OF Ti02 POWDER. Takayuki Yonezawa; Tomohiro Yoshimura; Junko Umeda; Katsuyoshi Kondoh; Ryouichi Souba // International Journal of Powder Metallurgy;Winter2014, Vol. 50 Issue 1, p33 

    The article presents a study which investigates the microstructures and mechanical properties of sintered and extruded titanium-nickel (TiNi) shape-memory alloys. Particular focus is given to the use of titanium dioxide (TiO2) powder to control the concentration of nickel through spark plasma...

  • Analysis of Energy Absorption for NiTi Wires under Different Diameters and Loop Types. MEDEIROS, Ivan; FANGUEIRO, Raul // Journal of Textile Engineering;Nov/Dec2013, Vol. 59 Issue 6, p165 

    This paper presents the research undertaken at the University of Minho aiming to study the behaviour of 3D weft-knitted structures using Shape Memory Alloy (SMA) wires and elastomeric yarns, in order to produce dynamic, structures as a support to answer specific situations and applications....


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics