Effects of grain size on compressive behavior of NiTi polycrystalline superelastic macro- and micropillars

Kabirifar, Parham1; Chu, Kangjie1; Ren, Fuzeng2; Sun, Qingping1

2018-03

10.1016/j.matlet.2017.11.069

MATERIALS LETTERS   影响因子和分区

0167-577X

1873-4979

Polycrystalline NiTi pillars of 0.5 mu m diameter and 1.5 mu m height with average grain sizes from 10 to 421 nm are fabricated by focused ion beam and compressed by nanoindentation. It is found that stress-strain hysteresis loop area, transformation stress and transformation strain vary non-monotonically with grain size. Analysis of the results reveals that increasing the grain size from 10 nm enhances the transformation by promoting the nucleation and growth of martensite domains. When the grain size approaches the pillar size, the transformation is suppressed by an increase in granular constraints and heterogeneity of internal stress-strain state among large grains. (C) 2017 Elsevier B.V. All rights reserved.

Size effect Shape memory alloys Martensitic phase transformation FIB Nanoindentation

SCI ; EI

英语

通讯

Fundamental Research Program of Shenzhen[JCYJ20170307110418960] ; Fundamental Research Program of Shenzhen[JCYJ20170412153039309]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied

WOS:000419724400014

ELSEVIER

20175004520089

Binary alloys ; Grain size and shape ; Ion beams ; Martensitic transformations ; Nanoindentation ; Shape memory effect ; Titanium alloys

Metallography:531.2 ; Titanium and Alloys:542.3 ; Nanotechnology:761 ; High Energy Physics:932.1 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Clear Water Bay Rd, Kowloon, Hong Kong, Peoples R China
2.South Univ Sci & Technol China, Dept Mat Sci & Engn, Shenzhen, Guangdong, Peoples R China

Kabirifar, Parham,Chu, Kangjie,Ren, Fuzeng,et al. Effects of grain size on compressive behavior of NiTi polycrystalline superelastic macro- and micropillars[J]. MATERIALS LETTERS,2018,214:53-55.

Kabirifar, Parham,Chu, Kangjie,Ren, Fuzeng,&Sun, Qingping.(2018).Effects of grain size on compressive behavior of NiTi polycrystalline superelastic macro- and micropillars.MATERIALS LETTERS,214,53-55.

Kabirifar, Parham,et al."Effects of grain size on compressive behavior of NiTi polycrystalline superelastic macro- and micropillars".MATERIALS LETTERS 214(2018):53-55.