Microstructural Evolution of Magnesium Alloy during Hot Compression

Li, Xing Cheng; Lu, Ya Lin; Wang, Jiang Tao; Dou, Lin

doi:10.4028/www.scientific.net/amm.446-447.158

Cited by 1 publication

(1 citation statement)

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“…The response time for DRV and DRX softening decreases simultaneously, and there is not enough time for plastic deformation, the critical resolved shear stress of the alloy increases, hence, leading to the flow stress increase. 10,[29][30] No prominent steady-state flow phenomenon could be seen after reaching the peak stress at the strain rate 10 s -1 . In the late stage of compression, the true stress decreases rapidly.…”

Section: True Stress-strain Curvesmentioning

confidence: 97%

Deformation behavior of the Mg-7Zn-3Cu-1Ce alloy during hot compression

Hu¹,

Meng²,

Zheng³

et al. 2018

Mater. Tehnol.

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The flow stress behavior of the Mg-7Zn-3Cu-1Ce alloy was studied on a Gleeble-1500 thermal/mechanical simulation test machine under the maximum deformation degree of 50 %, at a strain rate of 0.01 s-1 to 10 s-1 , and temperature of 573 to 673 K. The hot deformation behavior of the tested alloy during the hot compression process was studied. The experimental results showed that the correlation of the flow stress, strain rate and temperature was obvious and the tested alloy was a strain-ratesensitive material. The deformation activation energy (Q = 191 kJ/mol) and the corresponding stress exponent (n = 5.68) were evaluated by linear regression analysis during the hot deformation process. And the flow stress constitutive equation of the Mg-7Zn-3Cu-1Ce alloy was built by introducing the Zener-Hollomon parameter. There was no recrystallization phenomenon in the microstructure of the tested alloy after hot-compression, and dynamic recovery is the main softening mechanism during the high-temperature deformation. The extruded alloy (extrusion at 673 K) shows excellent mechanical properties both at room and at mid-high temperature.

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Section: True Stress-strain Curvesmentioning

confidence: 97%