Optimization of the hot workability for an extrude AZ80 Mg alloy using the processing map and Kriging meta-model

In this study, optimum processing conditions for strip-cast AZ31 Mg alloy was investigated on the basis of processing map and microstructural analysis. To obtain the processing map, isothermal compression tests were carried out to a strain of 0.5 at temperatures of 200 ∼ 400°C with the strain rates of 0.01 ∼ 10s-1. It was found that maximum efficiency indicating the optimum processing condition occurred at 300°C and 10s-1. The possible deformation mechanisms operating at high temperature was also discussed.

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Characterization of hot workability in AA 7050 aluminum alloy using activation energy and 3-D processing map

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2015.05.018 ◽

2015 ◽

Vol 225 ◽

pp. 110-121 ◽

Cited By ~ 62

Author(s):

S. Wang ◽

L.G. Hou ◽

J.R. Luo ◽

J.S. Zhang ◽

L.Z. Zhuang

Keyword(s):

Activation Energy ◽

Aluminum Alloy ◽

Processing Map ◽

Hot Workability ◽

7050 Aluminum Alloy

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Hot Workability Map for Near-α Titanium Alloy Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.7Nd

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.482-484.1453 ◽

2012 ◽

Vol 482-484 ◽

pp. 1453-1456

Author(s):

Ming Man Li ◽

Qui Jian Xun ◽

Shang Zhou Zhang

Keyword(s):

Titanium Alloy ◽

Dynamic Recrystallization ◽

Power Dissipation ◽

Processing Map ◽

Flow Instability ◽

Shear Bands ◽

Hot Workability ◽

Adiabatic Shear Bands ◽

Β Phase ◽

Power Dissipation Efficiency

The characterizations of hot working behavior of a near-α titanium alloy using the approach of processing maps are described. Processing map in the α+β region exhibit a domain of the globularization process of lamellar structure and α dynamic recrystallization with a power dissipation efficiency of 0.6-0.9. In the β region the map exhibited a domain centered around 1060°C and 0.1 s-1with a power dissipation efficiency of 0.76 where the β phase undergoes dynamic recrystallization. At higher strain rate flow instability occurs in the α+β region due to adiabatic shear bands formation as well as in the β region due to flow inhomogeneity of β phase.

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High Temperature Deformation Behavior of AZ31 Mg Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.2927 ◽

2005 ◽

Vol 475-479 ◽

pp. 2927-2930 ◽

Cited By ~ 12

Author(s):

B.H. Lee ◽

Kwang Seon Shin ◽

Chong Soo Lee

Keyword(s):

High Temperature ◽

Deformation Behavior ◽

Processing Map ◽

Tensile Elongation ◽

Mg Alloy ◽

High Temperature Deformation ◽

Temperature Deformation ◽

Deformation Method ◽

Az31 Mg Alloy ◽

Average Grain Size

High temperature deformation behavior of AZ31 Mg alloy was investigated in this study on the basis of a processing map (e » 0.6). To construct a processing map, compression tests were carried out at various temperatures and strain rates. Two regions of high deformation efficiency (h) were identified as: (1) a dynamic recrystalization (DRX) domain at 250°C and 1/s and (2) a superplasticity domain at 450°C and 10-4/s. The average grain size observed in the DRX region was considerably smaller (2.9µm) than in any other region. In the superplastic condition, tensile elongation to failure approached to 1040%. At the high Z regions, flow softening occurred resulting from the dynamic recrystallization but below 1010 of Z value, flow hardening occurred due to the grain growth. Possible deformation mechanisms operating at high temperature were discussed in relation to the activation energy. A two-stage deformation method was found to be effective in enhancing the superplasticity of AZ31 Mg alloy.

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