title: Detwining in Mg alloy with a high density of twin boundaries.
abstract: To investigate the role of preexisting twin boundaries in magnesium alloys during the deformation process, a large number of {10-12} tensile twins were introduced by a radial compression at room temperature before hot compressive tests with both low and high strain rates. Unlike the stable twins in Cu-based alloys with low stacking fault energies, {10-12} twins in Mg alloy are extremely unstable or easy to detwin through {10-12}-{10-12} re-twinning. As a result, non-lenticular residual twins and twin traces with misorientation of 5°-7° were present, as confirmed by electron backscatter diffraction. The extreme instability of the twins during compression indicates that both twin and detwinning require extremely low resolved shear stresses under our experimental conditions.
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Yunping
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Engineering, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Cui
authors.affiliation: School of Engineering, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Huakang
authors.initials: H
authors.lastname: Bian
authors.affiliation: School of Engineering, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Shihai
authors.initials: S
authors.lastname: Sun
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Ning
authors.initials: N
authors.lastname: Tang
authors.affiliation: School of Engineering, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Yan
authors.initials: Y
authors.lastname: Chen
authors.affiliation: State Key Lab for Powder Metallurgy, Central South University, Changsha, Hunan, People's Republic of China.
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Koizumi
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Chiba
keywords: detwinning; electron backscattering diffraction (EBSD); forging; magnesium alloys; twinning