This study examines the grain characteristics, dynamic precipitation phase characteristics, and texture evolution of Mg-Ga-xZn alloys produced through medium-high strain rate rolling. It investigates the impact of Zn on the mechanical and damping properties of Mg-Ga sheet. The addition of Zn reduces the solid solubility of Ga in α-Mg, facilitating dynamic precipitation, grain refinement, and weakening of the basal texture of the sheet, ultimately enhancing strength and damping performance. The yield strength of the sheet initially increases and then decreases with increasing Zn content. The Mg-5Ga-0.6 Zn alloy demonstrates the best overall mechanical properties, with a yield strength, tensile strength, and elongation of 221 MPa, 304 MPa, and 28.6%, respectively, primarily attributed to fine-grained strengthening. Damping performance at low strain amplitudes also follows a similar trend with increasing Zn content, with Mg-5Ga-0.6 Zn showing the highest damping values. The study suggests that the decrease in damping performance due to Zn can be linked to the reduced solid solubility of Ga in α-Mg. Specifically, at a strain amplitude of 1 × 10^–3, the damping values Q^-1 of Mg-5Ga, Mg-5Ga-0.6 Zn, and Mg-5Ga-1.2 Zn alloy sheets are 0.0167, 0.0152, and 0.0174, respectively. These findings have implications for the development of bio-implantable magnesium alloys with high damping properties.

中文翻译：

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中高应变率轧制新型 Mg-Ga-Zn 合金的显微组织、力学性能和阻尼行为


本研究研究了通过中高应变率轧制生产的 Mg-Ga-xZn 合金的晶粒特性、动态沉淀相特征和织构演变。它研究了 Zn 对 Mg-Ga 板材的机械和阻尼性能的影响。Zn 的添加降低了 Ga 在 α-Mg 中的固溶度，促进了动态沉淀、晶粒细化和片材基底结构的弱化，最终增强了强度和阻尼性能。随着 Zn 含量的增加，片材的屈服强度最初增加后降低。Mg-5Ga-0.6 Zn 合金表现出最佳的整体机械性能，屈服强度、拉伸强度和伸长率分别为 221 MPa、304 MPa 和 28.6%，这主要归因于细晶强化。随着 Zn 含量的增加，低应变幅值的阻尼性能也遵循类似的趋势，其中 Mg-5Ga-0.6 Zn 显示出最高的阻尼值。研究表明，Zn 导致的阻尼性能降低可能与 Ga 在 α-Mg 中的固溶性降低有关。具体来说，在 1 × ^10-3 的应变幅值下，Mg-5Ga、Mg-5Ga-0.6 Zn 和 Mg-5Ga-1.2 Zn 合金板的阻尼值 ^Q-1 分别为 0.0167、0.0152 和 0.0174。这些发现对具有高阻尼性能的生物植入式镁合金的开发具有重要意义。