Strong and ductile texture-free ultrafine-grained magnesium alloy via three-axial forging
Strong and ductile texture-free ultrafine-grained magnesium alloy via three-axial forging
复制标题
通过三轴锻造获得高强度、延展性无织构超细晶镁合金
DOI：
10.1016/j.matlet.2022.133443
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发表时间：
2023
影响因子：
3
通讯作者：
Misra, R.D.K.
中科院分区：
文献类型：
--
作者：
Misra, R.D.K.
本文描述了将铸态合金退火与多轴锻造（MAF）（沿沿着x、y和z方向锻造）相结合的巧妙构思，该构思被应用于热机械加工贫镁-稀土合金并获得高强度和高延展性的组合。有趣的是，这种方法导致了无织构超细晶（UFG）结构，具有高达227 MPa的屈服强度和30%的伸长率。本研究的目的是描述初步的研究结果，并阐明结合显微组织和力学性能的MAF合金中的织构的演变。MAF在影响织构、微观结构和机械性能方面的贡献的发现从当前镁合金加工中的挑战的角度来看是重要的，所述镁合金具有六方密排（HCP）晶格，其具有限滑系统，这使得难以在低温下热机械加工。
We describe here the ingenious concept of combining annealing of as-cast alloy with multi-axial forging (MAF) (forging along x, y, and z-directions) that was applied to thermo-mechanically process a lean magnesium-rare earth alloy and obtain high strength and high ductility combination. This approach interestingly led to texture-free ultrafine-grained (UFG) structure with high yield strength of ∼227 MPa and elongation of ∼30 %. The objective of the study is to describe the preliminary findings and elucidate the evolution of texture in the MAF alloy in conjunction with the microstructure and mechanical properties. The discovery of the contribution of MAF in influencing texture, microstructure and mechanical properties is important from the perspective of current challenge in the processing of Mg alloys that has a hexagonal close-packed (HCP) lattice with limited slip systems, which makes it difficult to thermo-mechanically process at low temperatures.