Effect of c/a axial ratio on Schmid factors in hexagonal close-packed metals

Nan, Xiaolong; Wang, Huiyuan; Wu, Zhiqiang; Xue, En‐Song; Zhang, Lei; Jiang, Qi–Chuan

doi:10.1016/j.scriptamat.2012.12.006

Cited by 57 publications

(14 citation statements)

References 36 publications

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“…Schmid factor (SF) indicates the propensity for activation of various deformation modes 36 , although non-Schmid twinning in h.c.p. metals is quite common 37 .…”

Section: Resultsmentioning

confidence: 99%

On the evolving nature of c/a ratio in a hexagonal close-packed epsilon martensite phase in transformative high entropy alloys

Sinha

Nene

Frank

et al. 2019

Sci Rep

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Activation of different slip systems in hexagonal close packed (h.c.p.) metals depends primarily on the c/a ratio, which is an intrinsic property that can be altered through alloying addition. In conventional h.c.p. alloys where there is no diffusion-less phase transformation and associated transformation volume change with deformation, the c/a ratio remains constant during deformation. In the present study, c/a ratio and transformation volume change of h.c.p. epsilon martensite phase in transformative high entropy alloys (HEAs) were quantified as functions of alloy chemistry, friction stir processing and tensile deformation. The study revealed that while intrinsic c/a is dependent on alloying elements, c/a of epsilon in transformative HEAs changes with processing and deformation. This is attributed to transformation volume change induced dependence of h.c.p. lattice parameters on microstructure and stress state. Lower than ideal c/a ratio promotes non-basal pyramidal 〈c + a〉 slip and deformation twinning in epsilon phase of transformative HEAs. Also, a unique twin-bridging mechanism was observed, which provided experimental evidence supporting existing theoretical predictions; i.e., geometrical factors combined with grain orientation, c/a ratio and plastic deformation can result in characteristic twin boundary inclination at 45–50°.

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“…Schmid factor (SF) indicates the propensity for activation of various deformation modes 36 , although non-Schmid twinning in h.c.p. metals is quite common 37 .…”

Section: Resultsmentioning

confidence: 99%

On the evolving nature of c/a ratio in a hexagonal close-packed epsilon martensite phase in transformative high entropy alloys

Sinha

Nene

Frank

et al. 2019

Sci Rep

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“…For example, the dominant slip mode is 〈a〉 slip on the basal {0001} plane for Cd and Zn (c/a 41.633) but on the prismatic {1ī00} plane for Ti and Zr (c/ao 1.633), apart from certain exceptions (e.g. Mg, Be) [16]. Williams et al found that the slip mechanism changed with increasing temperature and Al addition [17].…”

Section: Resultsmentioning

confidence: 99%

Structure and mechanical properties of TiZr binary alloy after Al addition

Jiang

Jing

Liu

et al. 2013

Materials Science and Engineering: A

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“…The c/a ratio has no eect [15] on the Schmid factors for basal and prismatic slip in Mg (c/a = 1.624) and Ti (c/a = 1.589) single crystals of similar orientations. The titanium single crystals of various orientations were investigated by Akhtar [17,29], who found out that above 500 K (0.26T m ) the basal slip system is dominant [29].…”

Section: Introductionmentioning

confidence: 98%

“…Nan et al [15] The basal slip system is dominant for the hcp metals with c/a ≥ 1.633 [16] and prismatic slip system is dominant in the hcp metals with c/a < 1.633 [11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Crystallographic Orientation Changes during Deformation of Magnesium Single Crystals

Sułkowski

2014

Acta Phys. Pol. A

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Magnesium single crystals of three dierent orientations were deformed by tension at room temperature to investigate the geometrical criterion resulting from the Schmid law for activation of basal and non-basal slip systems. Changes of crystallographic orientations of investigated single crystals were systematically measured during deformation and the geometrical criterion was examined in respect to the changes of crystallographic orientations during deformation. The geometrical criterion itself failed to explain lack of activity of non-basal slip systems in the deformed magnesium single crystals. Therefore the ratio of activation volumes of soft to hard slip systems is considered to be introduced for a better understanding of the deformation in hcp metals.

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Effect of c/a axial ratio on Schmid factors in hexagonal close-packed metals

Cited by 57 publications

References 36 publications

On the evolving nature of c/a ratio in a hexagonal close-packed epsilon martensite phase in transformative high entropy alloys

On the evolving nature of c/a ratio in a hexagonal close-packed epsilon martensite phase in transformative high entropy alloys

Structure and mechanical properties of TiZr binary alloy after Al addition

Analysis of Crystallographic Orientation Changes during Deformation of Magnesium Single Crystals

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