The mechanism for the high dependence of the Hall-Petch slope for twinning/slip on texture in Mg alloys

Yu, Huihui; Li, Changzheng; Xin, Yunchang; Chapuis, Adrien; Huang, Xiaoxu; Liu, Qing

doi:10.1016/j.actamat.2017.02.044

Cited by 284 publications

(45 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fact, the volume fraction of fine grains (<20 μm) reached 37% in the ECAP alloy, which further increased to 61.5% after aging (Figure 4). A large number of fine grains mean a large number of high angle grain boundaries (HAGBs), which are widely believed to provide better strengthening during deformation because they are more effective in blocking dislocations [52,53]. Hence, the ECAP-aged alloy exhibited higher strength than the ECAP alloy.…”

Section: Discussionmentioning

confidence: 99%

Multimodal Microstructure and Mechanical Properties of AZ91 Mg Alloy Prepared by Equal Channel Angular Pressing plus Aging

Yang

Liu

et al. 2018

Metals

View full text Add to dashboard Cite

Developing cost-effective magnesium alloys with high strength and good ductility is a long-standing challenge for lightweight metals. Here we present a multimodal grain structured AZ91 Mg alloy with both high strength and good ductility, prepared through a combined processing route of low-pass ECAP with short-time aging. This multimodal grain structure consisted of coarse grains and fine grains modified by heterogeneous precipitates, which resulted from incomplete dynamic recrystallization. This novel microstructure manifested in both superior high strength (tensile strength of 360 MPa) and good ductility (elongation of 21.2%). The high strength was mainly attributed to the synergistic effect of grain refinement, back-stress strengthening, and precipitation strengthening. The favorable ductility, meanwhile, was ascribed to the grain refinement and multimodal grain structure. We believe that our microstructure control strategy could be applicable to magnesium alloys which exhibit obvious precipitation strengthening potential.

show abstract

Section: Discussionmentioning

confidence: 99%

Multimodal Microstructure and Mechanical Properties of AZ91 Mg Alloy Prepared by Equal Channel Angular Pressing plus Aging

Yang

Liu

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…Additionally, 33 ε′ denotes the contribution of twinning deformation for macro-strain tensor component ε33 applied along the 3 axis (the ND direction) in Figure 1. Furthermore, L denotes the free path of the twin lamella prior to encountering an obstacle (grain boundary, precipitate or other twins) and is visualized with its longest boundary traces on the sample observation plane by means of stereographic [30] that determines the orientation of twinning variants by using the trace method [46,47] and is illustrated in Figure 3a. Thus, the results indicate that L = 35.7 μm in grain G2-1.…”

Section: Discussionmentioning

confidence: 99%

Mechanism of {332}<113> Twinning Formation in Cold-Rolled Ti-Nb-Ta-Zr-O Alloy

Sun

Chen

2018

Metals

View full text Add to dashboard Cite

In this study, the mechanism of {332}<113> twinning formation in cold-rolled Ti-35Nb-2Ta-3Zr-O (wt %) alloy was investigated based on the Taylor-Bishop-Hill theory. The experimental data of crystal orientation in the rolling bite zone was obtained via electron back-scattered diffraction (EBSD). The deformation energy of {332}<113> twinning in the propagation stage was calculated using data from EBSD in terms of the Hall-Petch-type relation. The calculation results revealed that the mechanism of {332}<113> twinning formation in β-type Ti-35Nb-2Ta-3Zr-O (wt %) alloy contained two valid models, namely the shear-shuffle model and α″-assisted twinning model. This can help to clarify the mechanism of {332}<113> twinning formation further.

show abstract

“…Trace analysis is suitable to distinguish slip system types. 5,6) Here, slip systems can be determined by observing angles of slip lines in each grain by optical microscopy and comparing those with crystal orientations of grains analyzed by electron backscatter diffraction (EBSD). As trace analysis can distinguish which FPCS and SPCS slip systems caused ©c + aª slip, the effects of active slip systems on mechanical properties can be investigated.…”

Section: Introductionmentioning

confidence: 99%

Effects of Yttrium Addition on Plastic Deformation of Rolled Magnesium

et al. 2020

View full text Add to dashboard Cite

Tensile tests were applied to rolled MgY alloy sheets with three at% of yttrium-Mg0.54 at% Y, Mg0.9 at% Y, and Mg1.21 at% Y-to investigate effects of yttrium addition on activities of basal slip and non-basal slip systems so as to clarify the relationship between tensile properties and activities of slip systems. 0.2% proof stress of MgY alloys increased with increasing yttrium content ranging from 0.5 to 1.2 at%. Ductility increased with increasing yttrium content until 0.9 at% but decreased when 1.2 at% was added. Frequencies of basal and non-basal slips increased by yttrium addition. The frequency of f10 11gh11 23i first order pyramidal slip (FPCS) increased with increasing yttrium content until 0.9 at% and decreased when 1.2 at% was added. With increasing yttrium content, the frequency of f11 22gh11 23i second order pyramidal slip (SPCS) decreased, while that of f10 10gh11 20i prismatic slip (PS) increased. The highest total frequency of non-basal slips was observed in Mg 0.9Y, showing the highest ductility. Enhancement of ductility on magnesium was caused by activation of both basal and non-basal slips through yttrium addition.

show abstract

The mechanism for the high dependence of the Hall-Petch slope for twinning/slip on texture in Mg alloys

Cited by 284 publications

References 47 publications

Multimodal Microstructure and Mechanical Properties of AZ91 Mg Alloy Prepared by Equal Channel Angular Pressing plus Aging

Multimodal Microstructure and Mechanical Properties of AZ91 Mg Alloy Prepared by Equal Channel Angular Pressing plus Aging

Mechanism of {332}<113> Twinning Formation in Cold-Rolled Ti-Nb-Ta-Zr-O Alloy

Effects of Yttrium Addition on Plastic Deformation of Rolled Magnesium

Contact Info

Product

Resources

About