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.

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Wu, Jing ; Si, Shanshan ; Takagi, Kosuke ; Li, Tian ; Mine, Yoji ; Takashima, Kazuki ; Chiu, Yu-Lung. / Study of basal <a> and pyramidal <c+a> slips in Mg-Y alloys using micro-pillar compression. In: Philosophical Magazine. 2020 ; Vol. 100, No. 11. pp. 1454-1475.

Bibtex

@article{1c8e5bdc34f14854ad84ceaf2f1c2f06,
title = "Study of basal and pyramidal slips in Mg-Y alloys using micro-pillar compression",
abstract = "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.",
keywords = "CRSS, Mg-Y, micro-pillar compression, pyramidal slip, twinning",
author = "Jing Wu and Shanshan Si and Kosuke Takagi and Tian Li and Yoji Mine and Kazuki Takashima and Yu-Lung Chiu",
year = "2020",
month = feb,
day = "12",
doi = "10.1080/14786435.2020.1725250",
language = "English",
volume = "100",
pages = "1454--1475",
journal = "Philosophical Magazine",
issn = "1478-6435",
publisher = "Taylor & Francis",
number = "11",

}

RIS

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 -