Microstructure and mechanical properties of a basal textured AZ31 magnesium alloy cryorolled at liquid-nitrogen temperature

Luo, Jinru; Yan, Ya-qiong; Zhang, Jishan; Zhuang, Linzhong

doi:10.1007/s12540-016-5645-1

Cited by 10 publications

(1 citation statement)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Naturally, the improved combination of good mechanical properties are due to reduced density of defects such as dislocation and pronounced precipitation hardening during aging or annealing treatment. Because of the competitive advantage, cryorolling was also used in processing other metals such as titanium [14], magnesium [15] et al Dramatically, in present work, cryorolling has been successfully adopted to produce UFG structure in an AA6082 alloy extrusion.…”

Section: Introductionmentioning

confidence: 93%

Effect of cryorolling on microstructure and mechanical properties of a peak-aged AA6082 extrusion

Liu

Jia

et al. 2017

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Peak-aged AA6082 flat extrusions were cryorolled at liquid nitrogen temperature to three different thickness reductions, the reductions were 21%, 42% and 85%, respectively.For comparison, an identical extrusion was rolled at room temperature to a reduction of 85%.The microstructure and plastic deformation behaviors of the initial as well as the rolled materials were studied by means of electron microscopy and tensile tests at room temperature.The initial material showed fibrous grain structure. After cryorolling to 21% thickness reduction, grains in the alloy were further elongated. In addition, microbands were detected in some grains, while other grains were microband-free. More detailed information was obtained in the sample after 42% thickness reduction. Here, numerous microbands aligned along slip planes with the highest resolved shear stress, leading to the formation of new low angle subgrains and high angle grains. In the case of microband-free grains, multiple slip systems were activated concurrently due to similar and low Schmid factors, hence producing homogeneous deformation within these grains. A cryorolling strain of 85% produced a hierarchical microstructure in the materials volume, consisting of nano-and ultrafine grains with size < 100 nm coexisted with micro-sized grains. The development of hierarchical 2 microstructure could be considered as a consequence of the intersection between families of microbands. As a result, both the strength and uniform elongation of the severely cryorolled alloy, i.e. 85% thickness reduction, are more superior to rest of rolled alloys. Therefore, this study revealed that a simple processing procedure, i.e., cryorolling, can be utilized to tailor for desired properties in favor of both strength and ductility aluminum alloy.

show abstract

Section: Introductionmentioning

confidence: 93%