Tensile properties and occurrence of low temperature superplasticity of ECAE processed Mg-Li-Zn alloys.

雄, 吉田; 英明, 山田; 重晴, 鎌土; 陽, 小島

doi:10.2464/jilm.51.551

Cited by 21 publications

(11 citation statements)

References 13 publications

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“…Table 1 illustrates the grain sizes achieved using a large strain hot rolling process. The resulting grain sizes are similar to the grain sizes obtained by more sophisticated methods such as powder metallurgy [18] or even ECAE [71][72][73].…”

Section: Large Strain Hot Rolling (Lshr)supporting

confidence: 64%

Influence of thermomechanical processing on the grain size, texture and mechanical properties of Mg-Al alloys

Srinivasarao¹,

Valle²,

Ruano³

et al. 2012

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The work carried out by the authors over the last decade on the processing, microstructural characterization and the mechanical behaviour of Mg alloys is reviewed. In particular, the potential for grain refinement and for the development of specific textures of large strain hot rolling (LSHR), equal channel angular pressing (ECAP) and accumulative roll bonding (ARB) is discussed. The recrystallization and the deformation mechanisms predominant in Mg alloys are analysed as a function of the grain size and the texture in a wide range of stresses, strain rates and temperatures. Finally, the feasibility of superplastic forming of Mg alloys was examined, taking into account the influence of factors such as grain size stability and microstructural heterogeneities.K e y w o r d s : magnesium alloys,

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Section: Large Strain Hot Rolling (Lshr)supporting

confidence: 64%

Influence of thermomechanical processing on the grain size, texture and mechanical properties of Mg-Al alloys

Srinivasarao¹,

Valle²,

Ruano³

et al. 2012

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“…This high Z value 20) is consistent with the significant grain refinement observed. The size of the recrystallized grains formed during processing is comparable to that achieved by more sophisticated methods such as powder metallurgy 5) or even ECAE in some cases, [8][9][10] although the microstructure is rather heterogeneous. Gholina et al 21) have recently used large strain hot rolling to develop microstructures with grain sizes on the order of 1 mm in AlMg alloys.…”

Section: Discussionmentioning

confidence: 72%

“…7) In particular, several investigations on Mg alloy processing by equal-channel-angular extrusion have been reported in the last five years. [8][9][10][11][12][13] Grain sizes of about 1 mm were obtained in an AZ91 alloy. 8) However, SPD techniques only allow processing small billets and are therefore nowadays not viable for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement in a Mg AZ91 Alloy via Large Strain Hot Rolling

et al. 2003

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Significant grain refinement has been achieved in a cast Mg-based AZ91 alloy via large strain hot rolling. This is a simple processing method consisting of one rolling pass at intermediate temperatures with a large thickness reduction. The as-cast material was first homogeneized in order to obtain a homogeneous and equiaxed grain structure with a random texture. During processing, a double-peak basal texture develops, typical of rolled Mg alloys, that results from the operation of basal, prismatic and pyramidal hc þ ai slip. The stabilization of this deformation texture during rolling suggests that the mechanism for grain refinement is continuous dynamic recrystallization.

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“…Similar microstructure can be found in previous studies about the Mg-Li alloys casted by ingot metallurgy method. 4,12) The total diffusing thickness (including the mixture layer) was $50 mm for 3.4 V/1 h. A higher applied voltage caused it up to $300 mm for 3.6 V/1 h and $600 mm for 3.8 V/1 h, respectively. The X-Ray diffraction spectra for the electrolytic diffusing samples 3.4, 3.6 and 3.8 V/1 h were indicated in Fig.…”

Section: Resultsmentioning

confidence: 95%

Preparation of Mg–Li–Al–Zn Master Alloy in Air by Electrolytic Diffusing Method

Lin

Uan

2005

Mater. Trans.

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Electrolytic diffusing method was conducted at 500 C to prepare Mg-Li-Al-Zn master alloy in air. It was also explored for the melting and casting of Mg-Li alloy in air, as the Mg-Li-Al-Zn master alloy used as raw material. A mixture of 45 mass% lithium chloride (LiCl) and 55 mass% potassium chloride (KCl) was employed as the electrolyte. Mg-9 mass%Al-1 mass% Zn (AZ91) alloy was used as cathode material while graphite selected as anode. Experimental results showed that the electrolysis current linearly depended on the applied working voltage. Deposition of lithium occurred on the cathode surface. After the electrolysis experiments, Mg-12 mass% Li-9 mass% Al-1 mass% Zn alloy sheet can be obtained. At working voltage of 4.2 V and one hour electrolysis, the hexagonal-closed-pack AZ91D sheet (1.5-mm thickness) was fully converted to body-centered-cubic Mg-Li-Al-Zn alloy. The formation of Mg-Li phase during electrolysis was studied by inductively coupled plasma-atomic emission spectrometer (ICP), X-ray diffraction, and optical microscopy. It is diffusion rather than deposition rate (electrolysis current) that controlled the depth of Mg-Li phase formed in the cathode sample. The Mg-Li-Al-Zn alloy used as master alloys could be melted and casted in air without ignition. However, the content of lithium in the as-cast block was reduced to 3.77 mass%, properly due to oxidation of lithium metal during melting.

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Tensile properties and occurrence of low temperature superplasticity of ECAE processed Mg-Li-Zn alloys.

Cited by 21 publications

References 13 publications

Influence of thermomechanical processing on the grain size, texture and mechanical properties of Mg-Al alloys

Influence of thermomechanical processing on the grain size, texture and mechanical properties of Mg-Al alloys

Grain Refinement in a Mg AZ91 Alloy via Large Strain Hot Rolling

Preparation of Mg–Li–Al–Zn Master Alloy in Air by Electrolytic Diffusing Method

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Tensile properties and occurrence of low temperature superplasticity of ECAE processed Mg-Li-Zn alloys.

Cited by 21 publications

References 13 publications

Influence of thermomechanical processing on the grain size, texture and mechanical properties of Mg-Al alloys

Influence of thermomechanical processing on the grain size, texture and mechanical properties of Mg-Al alloys

Grain Refinement in a Mg AZ91 Alloy via Large Strain Hot Rolling

Preparation of Mg&ndash;Li&ndash;Al&ndash;Zn Master Alloy in Air by Electrolytic Diffusing Method

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Preparation of Mg–Li–Al–Zn Master Alloy in Air by Electrolytic Diffusing Method