Achieving high strength in indirectly-extruded binary Mg–Ca alloy containing Guinier–Preston zones

Pan, Hucheng; Qin, Gaowu; Ren, Yuping; Wang, Liqing; Sun, Shen; Meng, Xiangying

doi:10.1016/j.jallcom.2015.01.068

Cited by 44 publications

(15 citation statements)

References 44 publications

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“…This second phase was confirmed in the present as-cast material. According to the observations from references, [15][16][17] these small disc precipitates could be considered as Mg 2 Ca precipitates. Further investigations will be needed to identify them in the future using HAADF techniques.…”

Section: Resultsmentioning

confidence: 97%

The Role of Second Phases on the Creep Behavior of As-Cast and Hot-Extruded Mg-Ca-Zr Alloys

You

Huang

Dieringa

et al. 2019

JOM

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The effect of second phases on the creep behavior of Mg-Ca-Zr alloys was investigated. Casting and hot-extrusion processes were performed to prepare Mg-xCa-0.5Zr (x = 0 wt.%, 0.3 wt.% and 0.6 wt.%) alloys with different morphologies and distributions of second phases. The as-cast microstructures of Mg-Ca-Zr alloys consisted of an Mg matrix and coarse Mg 2 Ca intermetallic compounds distributed at the grain boundaries. The hot-extruded microstructures exhibited finer Mg 2 Ca spherical particles and precipitates distributed homogeneously inside the matrix and along the grain boundaries. The results of creep tests suggested that the viscous glide of dislocation and dislocation climb were the dominant creep mechanisms of Mg-Ca-Zr alloys crept at 200°C. The creep property was strongly related to the morphology and distribution of the Mg 2 Ca phases. The finer and more homogeneously distributed particles showed a better strengthening effect than the coarser intermetallic compounds distributed along the grain boundaries.

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Section: Resultsmentioning

confidence: 97%

The Role of Second Phases on the Creep Behavior of As-Cast and Hot-Extruded Mg-Ca-Zr Alloys

You

Huang

Dieringa

et al. 2019

JOM

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“…Researches have indicated that the parameters of the tensile yield strength depend on the grain size and texture. And due to the high k coefficient, Mg alloys have more pronounced hardening behavior than that of Al alloys [ 46 , 47 ]. Yuan et al [ 48 ] found that k is 205 MPa μm 1/2 when the grain size is about 2 μm.…”

Section: Discussionmentioning

confidence: 99%

Achieving High Yield Strength and Ductility in As-Extruded Mg-0.5Sr Alloy by High Mn–Alloying

Zhou

Peng

et al. 2020

Materials

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The effect of Mn on the microstructure and mechanical properties of as-extruded Mg-0.5Sr alloy were discussed in this work. The results showed that high Mn alloying (2 wt.%) could significantly improve the mechanical properties of the alloys, namely, the tensile and compressive yield strength. The grain size of as-extruded Mg-0.5Sr alloys significantly was refined from 2.78 μm to 1.15 μm due to the pinning effect by fine α-Mn precipitates during the extrusion. Moreover we showed that the tensile yield strength and the compressive yield strength of Mg-0.5Sr-2Mn alloy were 32 and 40 percent age higher than those of Mg-0.5Sr alloy, respectively. Moreover, the strain hardening behaviors of the Mg-0.5Sr-2Mn alloy were discussed, which proved that a large number of small grains and texture have an important role in improving mechanical properties.

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“…The cast billets of Mg-Gd-Y-Zn alloys with different Sr additions are prepared by melting the commercial pure Mg, pure Zn, pure Sr, Mg-30Gd and Mg-30Y master alloys and pouring the melt into cylinder mould with mixture protection gas of SF 6 and CO 2 (1:100). The nominal composition of the samples is designed as…”

Section: Methodsmentioning

confidence: 99%

“…Magnesium alloys have great potential of reducing vehicle weight because of their high specific strength and stiffness [1][2][3][4][5][6][7]. In the past decade, the Mg-Gd-Y-Zn based alloys containing long period stacking ordered (LPSO) structures have been shown to exhibit excellent mechanical properties, including the high tensile strength of over 500 MPa at room temperature [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

On the microstructure and mechanical property of as-extruded Mg-Gd-Y-Zn alloy with Sr addition

Liu

Diao

Chai

et al. 2017

Materials Science and Engineering: A

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In this study, microstructure evolutions of 0.2, 0.6) alloys (named as sample 0Sr, 0.2Sr, 0.6Sr) during heat-treatment and extrusion were investigated. As-cast sample 0Sr contains typical long period stacking ordered (LPSO) phases and Mg 3 RE. With Sr addition, amounts of LPSO phases decrease and are gradually replaced by the Mg 17 Sr 2 phases. After homogenization and annealing treatment, profuse strip LPSO phases readily precipitate in grain interiors of sample 0Sr, while only Mg 17 Sr 2 and Mg 3 RE phases are detected in samples 0.2Sr and 0.6Sr. It suggests that the Sr addition would inhibit LPSO phases. After extrusion, the bimodal grain structures, the bulk and strip LPSO phases are detected in sample 0Sr, which can contribute to providing strengthening and extra strain hardening. In as-extruded sample 0.2Sr, finer recrystallized grain size, bulk Mg 17 Sr 2 and LPSO phases (micron-scale) and Mg 5 RE phase (nano-scale) are found due to the pre-annealing treatment. However, lower amounts of both nano-sized and macro-sized LPSO phases lead to the low ultimate strength (300 MPa). In sample 0.6Sr, the strip LPSO phases are readily formed even though the length and total amounts of LPSO phases decrease.More bulk Mg 17 Sr 2 phases and LPSO phases are also precipitated, which lead to the more superior yield and ultimate strengths of 0.6Sr sample under higher temperature, as compared with the 0Sr sample.2

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Achieving high strength in indirectly-extruded binary Mg–Ca alloy containing Guinier–Preston zones

Cited by 44 publications

References 44 publications

The Role of Second Phases on the Creep Behavior of As-Cast and Hot-Extruded Mg-Ca-Zr Alloys

The Role of Second Phases on the Creep Behavior of As-Cast and Hot-Extruded Mg-Ca-Zr Alloys

Achieving High Yield Strength and Ductility in As-Extruded Mg-0.5Sr Alloy by High Mn–Alloying

On the microstructure and mechanical property of as-extruded Mg-Gd-Y-Zn alloy with Sr addition

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