Effect of Aging Heat Treatment on the High Cycle Fatigue Life of Ni50.3Ti29.7Hf20 High-Temperature Shape Memory Alloy

被引：0
作者：
Hasan H. Saygili
H. Onat Tugrul
Benat Kockar
机构：
[1] Hacettepe University,Department of Mechanical Engineering
[2] Turkish Aviation Industry,undefined
[3] Rotary Wing Technology Center,undefined
来源：
Shape Memory and Superelasticity | 2019年 / 5卷
关键词：
Fatigue; NiTiHf; Shape memory; Aging;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Shape memory alloys can be utilized as actuators for several applications in aerospace industry which require high strength and stable actuation cycles together with the transformation temperatures above 100 °C. Aging is one of the methods for Nickel rich NiTiHf alloys that adjusts the transformation temperatures and enhances the cyclic stability due to the formation of nano-sized precipitates. In this study, the high cycle functional fatigue life and behavior of the extruded and aged Ni50.3Ti29.7Hf20 high-temperature shape memory alloy were investigated in order to reveal the effect of aging on the stability of the actuation strain and transformation temperatures. The aging was conducted at 550 °C for 3 h. 200 MPa was chosen in the functional fatigue experiments since no irrecoverable strain was determined under this stress magnitude for the extruded and the aged samples in the load-biased heating cooling experiments. The fatigue experiments were conducted twice to check the repeatability of the shape memory properties of the samples and it was observed that the life cycle of the aged sample was determined as 20,337 and the extruded sample completely lost the shape recovery ability after 5000 cycles.
引用
收藏
页码：32 / 41
页数：9
相关论文
共 109 条
  • [1] Singh K(2003)An improved shape memory alloy actuator for rotor blade tracking J Intell Mater Syst Struct 14 767-786
  • [2] Sirohi J(2003)Design and implementation of a shape memory alloy actuated reconfigurable airfoil J Intell Mater Syst Struct 14 257-273
  • [3] Chopra I(2007)Aerospace applications of shape memory alloys J Aerosp Eng 221 535-552
  • [4] Strelec JK(2004)Defense advanced research projects agency–Smart materials and structures demonstration program overview airfoil J Intell Mater Syst Struct 15 227-233
  • [5] Lagoudas DC(2003)Design of space systems using shape memory alloys Smart Mater Struct 5056 545-558
  • [6] Khan MA(2005)Physical metallurgy of Ti–Ni-based shape memory alloys Prog Mater Sci 50 511-678
  • [7] Yen J(2008)Thermomechanical cyclic response of an ultrafine-grained NiTi shape memory alloy Acta Mater 56 3630-3646
  • [8] Hartl DJ(2007)Effect of severe ausforming via equal channel angular extrusion on the shape memory response of a NiTi alloy J Nucl Mater 361 298-305
  • [9] Lagoudas DC(2010)High temperature shape memory alloys Int Mater Rev 55 257-315
  • [10] Sanders B(2010)Role of severe plastic deformation on the cyclic reversibility of a Ti Acta Mater 58 6411-6420
12345678910