Study of basal <a> and pyramidal <c+a> slips in Mg-Y alloys using micro-pillar compression

Jing Wu, Shanshan Si, Kosuke Takagi, Tian Li, Yoji Mine, Kazuki Takashima, Yu-Lung Chiu

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5 Citations (Scopus)
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The effect of yttrium (Y) on the critical resolved shear stresses (CRSS) of < a > basal slip, {101̅2}⟨1̅011⟩ tension twinning and < c + a > pyramidal slip has been studied using micro-pillar compression tests along selected orientations at room temperature, on two magnesium (Mg) alloys with different Y contents (0.4 and 4 wt.%). The CRSS of < a > basal slip increased slightly from 30 ± 1 MPa (for Mg-0.4Y) to 37 ± 3 MPa (for Mg-4Y). In Mg-0.4Y, the resolved shear stress to activate the {101̅2}⟨1̅011⟩ tension twin was determined to be 45 ± 12 MPa, while in Mg-4Y it was 113 MPa. The compressed samples were studied using scanning electron microscopy (SEM), transmission Kikuchi diffraction (TKD) and transmission electron microscopy (TEM). It was found that < c + a > dislocations slip mainly on {1̅1̅22} (Pyra II) planes with a CRSS of about 119 MPa in Mg-0.4Y and slip mainly on {01̅11} (Pyra I) planes in Mg-4Y with a CRSS of 106 MPa. There is a significantly lowered CRSS ratio between < c + a > slip and < a > basal slip in both alloys (2.8 and 4.8) compared with that reported in bulk pure Mg (∼100). The easy activation of < c + a > on Pyramidal I slip is expected to promote the frequent cross-slip in Mg-4Y alloy.
Original languageEnglish
Pages (from-to)1454-1475
Number of pages22
JournalPhilosophical Magazine
Issue number11
Publication statusPublished - 12 Feb 2020


  • CRSS
  • Mg-Y
  • micro-pillar compression
  • pyramidal slip
  • twinning

ASJC Scopus subject areas

  • Condensed Matter Physics


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