Microstructure Evolution and Mechanical Properties of a SMATed Mg Alloy under In Situ SEM Tensile Testing

Liu, Xiaowei; Liu, Yong; Jin, Bin; Lu, Yang; Lü, Jian

doi:10.1016/j.jmst.2016.11.012

Cited by 43 publications

(11 citation statements)

References 33 publications

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“…The growing concerns on the environmental problems keep inspiring us to develop novel magnesium alloys, which possess great potentials in aircraft and automobiles for energy saving due to the obvious advantages of low density (~1/4 of steel and~3/5 of aluminum), high specific strength and ease of recycling [1,2]. However, the strengths of the current generation of Mg alloys are much lower than those of steels and Al-alloys [3e5].…”

Section: Introductionmentioning

confidence: 99%

Development of low-alloyed and rare-earth-free magnesium alloys having ultra-high strength

et al. 2018

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Developing ultra-high strength in rare-earth-free Mg alloys using conventional extrusion process is a great challenge. What is even more difficult is to achieve such a goal at a lower processing cost. In this work, we report a novel low-alloyed Mg-2Sn-2Ca alloy (in wt. %) that exhibits tunable ultra-high tensile yield strength (360e440 MPa) depending on extrusion parameters. More importantly, there is little drop in mechanical properties of this alloy even when it is extruded at a speed several times higher than those used in the reported high strength Mg alloys. Examination of as-extruded microstructures of this Cacontaining Mg alloy reveals that the ultra-high strength is mainly associated with the presence of surprisingly submicron matrix grains (down to~0.32 mm). The results suggest that the Ca addition promotes accumulations of the pyramidal dislocations, which eventually transform into the low angular grain boundaries (LAGBs). The high number density of LAGBs separate the a-Mg matrix via either discontinuous dynamic recrystallization (DDRX) mechanism in the early stage or the continuous dynamic recrystallization (CDRX) mechanism in the later stage of extrusion, which effectively enhances the nucleation rates of the DRXed grains. More importantly, large amount of Ca segregation along LAGBs, accompanied with dynamically precipitated Mg 2 Ca nano-phases, are detected in the present nonseverely deformed samples. It is the combination of solute segregations and numerous Mg 2 Ca nanoprecipitates that contributes to the formation of the ultra-fine grains via pinning mechanism. The ultrafine grains size, Ca enrichment in most LAGBs, and residual Mg 2 Ca nano-precipitates would in turn contribute significantly to the enhancement of the yield strength of the as-extruded Mg-2Sn-2Ca (wt.%) alloy. The low content of alloying elements and the fast one-step extrusion process render the present alloys low-cost and thus have great potential in large-scale industry applications.

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Section: Introductionmentioning

confidence: 99%

Development of low-alloyed and rare-earth-free magnesium alloys having ultra-high strength

et al. 2018

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“…Without the help of advanced micro/nanomanipulation instrument, it is hard to accomplish the in situ SEM characterization of nanomaterials. Owing to the precise techniques for positioning, sensing, and nanometer resolution manipulation, more and more nanorobotic manipulation systems have been installed in SEM to explore material characteristics with small scale [ 8 , 10 , 13 , 18 , 25 , 32 ]. Meanwhile, a large number of researchers have engaged in developing in situ SEM nanorobotic manipulation systems for material field for several decades [ 45 , 47 , 50 ], since the manipulators are useful for picking, placing, bonding nanosized components, and even exerting tensile, bending, and kinking force on them.…”

Section: Robotic In Situ Sem Micro/nanomanipulationmentioning

confidence: 99%

Recent Advances on In Situ SEM Mechanical and Electrical Characterization of Low-Dimensional Nanomaterials

Jiang

Zhang

et al. 2017

Scanning

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In the past decades, in situ scanning electron microscopy (SEM) has become a powerful technique for the experimental study of low-dimensional (1D/2D) nanomaterials, since it can provide unprecedented details for individual nanostructures upon mechanical and electrical stimulus and thus uncover the fundamental deformation and failure mechanisms for their device applications. In this overview, we summarized recent developments on in situ SEM-based mechanical and electrical characterization techniques including tensile, compression, bending, and electrical property probing on individual nanostructures, as well as the state-of-the-art electromechanical coupling analysis. In addition, the advantages and disadvantages of in situ SEM tests were also discussed with some possible solutions to address the challenges. Furthermore, critical challenges were also discussed for the development and design of robust in situ SEM characterization platform with higher resolution and wider range of samples. These experimental efforts have offered in-depth understanding on the mechanical and electrical properties of low-dimensional nanomaterial components and given guidelines for their further structural and functional applications.

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“…The grain size could be refined to 30±5nm through twinning and dynamic recrystallization (DRX) [17]. Grain refinement and dislocation accumulation at the surface layer led to a significant increment in micro-hardness [17,18]. The mechanical properties, especially for yield strength, also had a significant improvement [19].…”

Section: Introductionmentioning

confidence: 99%

The effect of surface mechanical attrition treatment on texture evolution and mechanical properties of AZ31 magnesium alloy

Peng

Zhang

Guo

et al. 2019

Materials Characterization

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Microstructure Evolution and Mechanical Properties of a SMATed Mg Alloy under In Situ SEM Tensile Testing

Cited by 43 publications

References 33 publications

Development of low-alloyed and rare-earth-free magnesium alloys having ultra-high strength

Development of low-alloyed and rare-earth-free magnesium alloys having ultra-high strength

Recent Advances on In Situ SEM Mechanical and Electrical Characterization of Low-Dimensional Nanomaterials

The effect of surface mechanical attrition treatment on texture evolution and mechanical properties of AZ31 magnesium alloy

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