Phase transformation behavior and pseudoelastic deformation in SrAl 2O4

H. Matsuo, K. Ikeda, S. Hata, H. Nakashima, H. Yamada, C. N. Xu

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Europium-doped strontium aluminate [SrAl2O4:Eu 2+] (SAOE) emits green light under an applied mechanical stress in a phenomenon called mechanoluminescence (ML). In order to clarify the relationship between ML and its structure, the microstructure, phase transformation behavior and structural change under a load on SAO ceramics were investigated. The microstructures were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It has been that SAO has a twin structure with three kinds of morphologies. The phase transformation behavior was investigated using differential scanning calorimetric (DSC) measurements and observation of the microstructures. It is indicated that the twin structures are formed by a thermoelastic martensitic transformation from a hexagonal (β) to a monoclinic (α) phase at about 670 C. In addition, the structural change under a load was observed by in situ TEM nanoindentation. It is clarified that pseudoelastic deformation occurred in SAO. These results suggest that ML occurs with rearrangement of variants of α phase. Crown

Original languageEnglish
Pages (from-to)S507-S516
JournalJournal of Alloys and Compounds
Volume577
Issue numberSUPPL. 1
DOIs
Publication statusPublished - Nov 15 2013

    Fingerprint

All Science Journal Classification (ASJC) codes

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

Cite this