Abstract Achieving high strength-ductility synergy is a great challenge in low-alloyed Mg alloys. In this work, a new Mg–1.0Zn–0.45Ca–0.35Sn–0.2Mn (wt.%, ZXTM1000) alloy was designed and fabricated by sub-rapid solidification (SRS) to overcome the dilemma. After hot rolling and annealing, the new alloy sheet exhibited an excellent tensile yield strength (YS, ∼270 MPa) and elongation (∼21%). Microstructure characterization revealed that the high YS was mainly attributed to the fine grains (∼3 μm) and high density of spherical Ca2Mg6Zn3, Mg2Ca, and α-Mn precipitates. Moreover, the homogeneous grain size distribution, weakened TD-split texture and the activation of multiple types of slips contributed to the enhanced ductility. The findings demonstrate an effective way to fabricate low-alloyed Mg alloys with high strength and ductility by combining the SRS and hot rolling.

中文翻译：

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亚快速凝固热轧开发具有高强塑性协同作用的低合金Mg-Zn-Ca-Sn-Mn合金

摘要 实现高强-塑性协同是低合金镁合金的一大挑战。在这项工作中，通过亚快速凝固 (SRS) 设计和制造了一种新的 Mg–1.0Zn–0.45Ca–0.35Sn–0.2Mn (wt.%, ZXTM1000) 合金以克服这一难题。热轧和退火后，新合金板表现出优异的拉伸屈服强度（YS，~270 MPa）和伸长率（~21%）。微观结构表征表明，高 YS 主要归因于球状 Ca2Mg6Zn3、Mg2Ca 和 α-Mn 沉淀物的细晶粒（~3 μm）和高密度。此外，均匀的晶粒尺寸分布、减弱的 TD-split 织构和多种类型滑移的激活有助于增强延展性。