Friction stir processing (FSP) has been applied to improve the microstructure and tensile performance of as-cast Mg–3Zn-0.5Zr magnesium alloy. By FSP, grains within the stir zone (SZ) demonstrate noticeable refinement and the varied processing parameters can lead to the formation of both strong and weak textures within the SZ. Second-phase particles are broken down, dispersed, and partially re-dissolved. In addition, optimal processing parameters lead to enhanced uniformity in refined grains and increased dispersion of secondary-phase particles, resulting in improved both in microhardness and tensile properties. The sample processed at 800-200 (rpm/mm∙min) demonstrates an overall improvement in tensile properties compared to the base material, with yield strength, ultimate strength, and uniform elongation of 93.7 MPa, 215.0 MPa, and 25.4%, respectively.

中文翻译：

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搅拌摩擦加工改善 Mg–3Zn-0.5Zr 的显微组织和力学性能

搅拌摩擦加工（FSP）已用于改善铸态 Mg-3Zn-0.5Zr 镁合金的显微组织和拉伸性能。通过 FSP，搅拌区 (SZ) 内的颗粒表现出明显的细化，并且不同的加工参数可导致在 SZ 内形成强织构和弱织构。第二相颗粒被分解、分散并部分重新溶解。此外，优化的加工参数可提高细化晶粒的均匀性和增加第二相颗粒的分散度，从而提高显微硬度和拉伸性能。在 800-200 (rpm/mm∙min) 下加工的样品表现出与基材相比拉伸性能的整体改善，屈服强度、极限强度和均匀伸长率分别为 93.7 MPa、215.0 MPa 和 25.4%。