Enabling manufacturing of multi-axial forging-induced ultrafine-grained strong and ductile magnesium alloys: a perspective of process-structure-property paradigm
Enabling manufacturing of multi-axial forging-induced ultrafine-grained strong and ductile magnesium alloys: a perspective of process-structure-property paradigm
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DOI：
10.1080/10667857.2023.2189769
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发表时间：
2023-03
影响因子：
3.1
通讯作者：
R. Misra
中科院分区：
文献类型：
--
作者：
R. Misra
镁（Mg）合金由于其六方密排（HCP）晶格而难以进行冷/热加工，这限制了滑移系统，使低温下的塑性变形成为一项具有挑战性的任务。多轴锻造（MAF）和铸态合金的退火相结合，创造了无织构的超细晶（UFG）组织，具有高强度和高延性的组合，以解决这一挑战。研究表明，与低强度粗晶（CG）镁合金相比，强韧性UFG镁合金从基底和锥体位错滑移到孪生发生了明显而根本的变化。这表明位错活动性、晶粒取向和特定的晶界状态在控制变形机制中起着重要作用。MAF加工镁合金的潜在影响，为轻量化和高效解决方案（包括能量吸收和成形性）开辟了强韧低密度材料的新领域，并为工艺-结构-性能关系提供了新的视角。
ABSTRACT Magnesium (Mg) alloys are difficult to cold/warm-process due to their hexagonal close-packed (HCP) lattice, which has restricted slip systems and makes plastic deformation at low temperatures a challenging task. Multi-axial forging (MAF) and annealing of as-cast alloys were combined to create a texture-free ultrafine-grained (UFG) structure with a high strength-high ductility combination to address this challenge. The study showed a clear and fundamental change from basal and pyramidal dislocation slip to twinning in the strong and ductile UFG Mg alloy compared to the low strength coarse-grained (CG) Mg alloy counterpart. This implied that the dislocation activity, grain orientation, and particular grain boundary states played an important role in controlling the deformation mechanisms. The potential impact of processing Mg alloys by MAF opens-up a new frontier of strong and ductile low-density materials for light and efficient solutions including energy absorption and formability and provides a perspective in terms of process-structure-property relationship.