Study of basal <a> and pyramidal <c+a> slips in Mg-Y alloys using micro-pillar compression
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Study of basal <a> and pyramidal <c+a> slips in Mg-Y alloys using micro-pillar compression. / Wu, Jing; Si, Shanshan; Takagi, Kosuke; Li, Tian; Mine, Yoji; Takashima, Kazuki; Chiu, Yu-Lung.
In: Philosophical Magazine, Vol. 100, No. 11, 12.02.2020, p. 1454-1475.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Study of basal and pyramidal slips in Mg-Y alloys using micro-pillar compression
AU - Wu, Jing
AU - Si, Shanshan
AU - Takagi, Kosuke
AU - Li, Tian
AU - Mine, Yoji
AU - Takashima, Kazuki
AU - Chiu, Yu-Lung
PY - 2020/2/12
Y1 - 2020/2/12
N2 - 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.
AB - 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.
KW - CRSS
KW - Mg-Y
KW - micro-pillar compression
KW - pyramidal slip
KW - twinning
UR - http://www.scopus.com/inward/record.url?scp=85079423129&partnerID=8YFLogxK
U2 - 10.1080/14786435.2020.1725250
DO - 10.1080/14786435.2020.1725250
M3 - Article
VL - 100
SP - 1454
EP - 1475
JO - Philosophical Magazine
JF - Philosophical Magazine
SN - 1478-6435
IS - 11
ER -