Nanoindentation deformation of a bi-phase AlCrCuFeNi2 alloy

Yuan Sun, Guangfeng Zhao, Xiyu Wen, Junwei Qiao, Fuqian Yang

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

High-entropy alloys (HEA) are multicomponent alloys with lattice structures, which have unique mechanical properties. Using X-ray diffraction, the structure of as cast AlCrCuFeNi2 HEA was characterized. The AlCrCuFeNi2 HEA consisted of body centered-cubic (BCC) solid solution and face centered-cubic (FCC) solid solution. Nanoindentation was used to characterize the indentation deformation of the FCC and BCC crystals in the AlCrCuFeNi2 HEA. Both the indentation hardness and the contact modulus of the FCC and BCC crystals decreased slightly with the increase in the indentation load and became constant for large indentation loads. For the indentation load larger than 500 μN, the contact modulus and the indentation hardness of the BCC crystals are 146 and 4.6 GPa, respectively, and the contact modulus and the indentation hardness of the FCC crystals are 207 and 2.8 GPa, respectively. The plastic energy dissipated in the nanoindentation increased with the indentation load and was proportional to the 1.77 and 1.88 power of the indentation load for the FCC and BCC crystals, respectively. The ratio of the dissipated plastic energy to the total energy in the indentations was a linear function of the ratio of the residual indentation depth to the corresponding maximum indentation depth. The slope of the energy ratio verse the indentation depth ratio for the BCC crystals is larger than that for the FCC crystals.

Original languageEnglish
Pages (from-to)49-53
Number of pages5
JournalJournal of Alloys and Compounds
Volume608
DOIs
StatePublished - Sep 25 2014

Bibliographical note

Funding Information:
Y.S. is grateful for the support of the Leading Academic Discipline Project of Shanghai Municipal Education Commission LADPSMEC through (Grant No. J51902 ) and the Science Research Foundation of Shanghai Municipal Education Commission through (Grant No. 11YZ269 ). J.W.Q. is grateful for the support of the National Natural Science Foundation of China (Grant Nos. 51101110 and 51371122 ), and the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi (2013).

Keywords

  • Contact modulus
  • Hardness
  • High-entropy alloys
  • Nanoindentation
  • Plastic energy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Nanoindentation deformation of a bi-phase AlCrCuFeNi2 alloy'. Together they form a unique fingerprint.

Cite this