Hardening mechanism of commercially pure Mg processed by high pressure torsion at room temperature

Qiao, Xiao Guang; Zhao, Ya Wei; Gan, Weimin; Chen, Ying; Zheng, M.Y.; Wu, Kun; Gao, Nong; Starink, M.J.

doi:10.1016/j.msea.2014.09.068

Cited by 63 publications

(44 citation statements)

References 59 publications

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“…2(a) indicates that the microstructure consists of nanograins with average sizes in the range of 5-10 nm. These grain sizes are significantly smaller than the average grain sizes of HPT-processed pure Ti (120-150 nm [57,58]), pure Mg ($1000 nm [59,60]) and many other pure metals [61] and intermetallics [62], but they are reasonably consistent with the grain sizes achieved in Mg-Ti alloys synthesized by ball milling ($10 nm [19][20][21]). The ring shape of the SAED pattern in Fig.…”

Section: Resultssupporting

confidence: 67%

Formation of metastable phases in magnesium–titanium system by high-pressure torsion and their hydrogen storage performance

et al. 2015

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Section: Resultssupporting

confidence: 67%

Formation of metastable phases in magnesium–titanium system by high-pressure torsion and their hydrogen storage performance

et al. 2015

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“…9 shows the variation of microhardness with the imposed equivalent strain. The equivalent strain is expressed as [10,31,32]:…”

Section: Discussionmentioning

confidence: 99%

“…It has been found that the microstructure of pure Mg, processed by extrusion followed by HPT for 8 turns at room temperature, is more homogenous than that of the as-cast counterpart, with grain sizes around ~1.0 μm and a hardness of ~52 HV [10]. In contrast, for Mg alloys, a more significant grain refinement can be obtained by HPT.…”

Section: Introductionmentioning

confidence: 99%

Evolution of microstructure and mechanical properties of an as-cast Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy processed by high pressure torsion

Sun

Qiao

et al. 2017

Materials Science and Engineering: A

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Abstract:The novel Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy with high content of rare earth elements has been processed successfully by high pressure torsion (HPT) starting from an as-cast condition. HPT processing was conducted at room temperature for a range of turns from 1/8 to 16, and the evolutions of microstructure and microhardness were investigated.The average grain size decreases from ~85 μm in the as-cast condition to ~55 nm when the equivalent strain reaches ~6.0, and remains almost constant on further strain increase. Meanwhile, the coarse netlike Mg3(Gd,Y) second phase structures are gradually broken into fine dispersed particles and the dislocation density increases. The microhardness of the alloy increases with increasing strain, and when the equivalent strain reaches ~6.0, the microhardness reaches a saturated value of about 115 HV, which is higher than that obtained by conventional extrusion / rolling of this alloy. The full range of possible mechanisms of hardening are analysed and this reveals that hardening is primarily due to the pronounced grain refinement, which is substantially 2 stronger than that for HPT-processed conventional Mg alloys, and to the homogeneously distributed fine second phase particles and the high dislocation density.

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“…The deviation of the c-axis from the torsion axis depends strongly on the HPT processing temperature [36]. Detailed texture analysis revealed a significant difference in the evolution of texture between the overall texture taken throughout the disk and the local texture at the disk edges up to 5 HPT turns [34,35].…”

Section: Introductionmentioning

confidence: 99%

“…The crystallographic texture of Mg-based alloys such as pure Mg, AZ31and ZK60A alloys after HPT processing was characterized by a basal texture where the c-axis rotates from the disc plane towards the torsion axis [33][34][35][36]. The deviation of the c-axis from the torsion axis depends strongly on the HPT processing temperature [36].…”

Section: Introductionmentioning

confidence: 99%

Texture and microhardness of Mg-Rare Earth (Nd and Ce) alloys processed by high-pressure torsion

Bourezg

Azzeddine

Baudin

et al. 2018

Materials Science and Engineering: A

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The influence of high-pressure torsion (HPT) processing on the texture and microhardness of two binary Mg-RE (RE=Nd and Ce) alloys was investigated using X-ray diffraction and Vickers microhardness measurements. Disks cut from the alloys were processed by HPT at room temperature for up to 10 turns. The precipitation products of both alloys were identified using synchrotron radiation. The results show that both alloys exhibit a weak basal texture where the c-axis of most grains is shifted 15° from the shear direction. An Mg-1.44Ce (wt. %) alloy showed a continuous decrease in the texture strength which may be due to the effect of second precipitation phases (Mg 17 Ce 2 and MgCe 2). The microhardness of both alloys increased significantly with increasing HPT turns but levelled-off beyond about one HPT turn. Maximum values of ~65 and ~96 Hv were achieved which are significantly higher than the hardness of the undeformed Mg-Ce and Mg-Nd alloys.

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Hardening mechanism of commercially pure Mg processed by high pressure torsion at room temperature

Cited by 63 publications

References 59 publications

Formation of metastable phases in magnesium–titanium system by high-pressure torsion and their hydrogen storage performance

Formation of metastable phases in magnesium–titanium system by high-pressure torsion and their hydrogen storage performance

Evolution of microstructure and mechanical properties of an as-cast Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy processed by high pressure torsion

Texture and microhardness of Mg-Rare Earth (Nd and Ce) alloys processed by high-pressure torsion

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