Fatigue-resistant NiTi micropillars with small hysteresis fabricated by micro severe plastic deformation

Chu，Kangjie; Ren，Fuzeng

2024-02-01

10.1016/j.matchar.2024.113637

Materials Characterization   影响因子和分区

1044-5803

Through compressing polycrystalline NiTi micropillars down to a 40% height reduction by nanoindentation equipment and subsequently manufacturing them by focused ion beam, cuboidal NiTi micropillars with a nanocrystal/nanolaminate heterostructure were obtained. Mechanical behavior and fatigue tests show that the heterostructured NiTi micropillars processed by micro severe plastic deformation (MSPD) have a large recoverable strain (4.5%), small hysteresis (4.3 MPa), and ultrahigh fatigue resistance (> 10 cycles) under a maximum applied stress of 2.5 GPa. These properties were attributed to the extreme grain refinement and homogeneous phase transformation occurring in the nanocrystals. The findings suggest that the MSPD holds great potential for fabricating superior materials for applications in small-scale engineering devices.

Fatigue resistance Grain refinement Micropillar NiTi shape memory alloy Severe plastic deformation

SCI ; EI

英语

第一 ; 通讯

MATERIALS SCIENCE

2-s2.0-85182402867

Scopus

Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Chu，Kangjie,Ren，Fuzeng. Fatigue-resistant NiTi micropillars with small hysteresis fabricated by micro severe plastic deformation[J]. Materials Characterization,2024,208.

Chu，Kangjie,&Ren，Fuzeng.(2024).Fatigue-resistant NiTi micropillars with small hysteresis fabricated by micro severe plastic deformation.Materials Characterization,208.

Chu，Kangjie,et al."Fatigue-resistant NiTi micropillars with small hysteresis fabricated by micro severe plastic deformation".Materials Characterization 208(2024).