Abstract Mixing two kinds of alloys in semi-solid temperature range allows obtaining new one with superior properties. Critical challenges facing the process are determination of mutual interaction of slurries, selection of appropriate temperature process, and designing optimal heat treatment conditions. Two kinds of magnesium chips E21 and WE43B containing different compositions of rare earth elements and similar solidus-liquidus temperature ranges were mixed in equal weight/volume ratio using thixoforming technology. Granules were hot compressed at 400 °C/5 min/200 MPa and thixoformed at 625 °C, which corresponded to about 25% of the liquid phase. Structure of E21WE43B thixo-cast consisted of globular grains of average size 59 μm. They were surrounded by the eutectic mixture coming from both alloys. X-ray analysis confirmed the presence of magnesium solid solution as well as intermetallics Mg3Nd and Mg24Y5 phases located in interglobular areas. T6 heat treatment consisted of solutioning at 525 °C for 8 h and aging at 190 °C for 120 h leading to increase of hardness from 57 to 85 HV. High resolution transmission electron microscopy studies allowed identifying β’ planar precipitates, approximately 8 x 2 nm in size and coherent with matrix, homogeneously distributed in the α(Mg) in the T6 treated sample. They were responsible for strengthening of E21WE43B thixo-cast leading in consequence to yield strength 190 MPa at compression strength 475 MPa at plasticity 13.1%.

中文翻译：

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Mg-Zn-RE合金的半固态混合——微观结构和机械性能

摘要 在半固态温度范围内混合两种合金可以得到性能优越的新合金。该工艺面临的关键挑战是确定浆料的相互作用、选择合适的温度工艺以及设计最佳热处理条件。使用触变成型技术将含有不同稀土元素组成和相似固液相线温度范围的两种镁片E21和WE43B以相等的重量/体积比混合。颗粒在 400°C/5 分钟/200 MPa 下热压，在 625°C 下触变成形，相当于液相的 25%。E21WE43B 触变铸件的结构由平均尺寸为 59 μm 的球状晶粒组成。它们被来自两种合金的共晶混合物包围。X 射线分析证实存在镁固溶体以及位于球间区域的金属间化合物 Mg3Nd 和 Mg24Y5。T6 热处理包括在 525°C 下固溶 8 小时和在 190°C 下时效 120 小时，导致硬度从 57 HV 增加到 85 HV。高分辨率透射电子显微镜研究允许识别 β' 平面沉淀物，尺寸约为 8 x 2 nm，与基质相干，均匀分布在 T6 处理样品的 α(Mg) 中。他们负责强化 E21WE43B 触变铸件，导致屈服强度为 190 MPa，压缩强度为 475 MPa，塑性为 13.1%。T6 热处理包括在 525°C 下固溶 8 小时和在 190°C 下时效 120 小时，导致硬度从 57 HV 增加到 85 HV。高分辨率透射电子显微镜研究允许识别 β' 平面沉淀物，尺寸约为 8 x 2 nm，与基质相干，均匀分布在 T6 处理样品的 α(Mg) 中。他们负责强化 E21WE43B 触变铸件，导致屈服强度为 190 MPa，压缩强度为 475 MPa，塑性为 13.1%。T6 热处理包括在 525°C 下固溶 8 小时和在 190°C 下时效 120 小时，导致硬度从 57 HV 增加到 85 HV。高分辨率透射电子显微镜研究允许识别 β' 平面沉淀物，尺寸约为 8 x 2 nm，与基质相干，均匀分布在 T6 处理样品的 α(Mg) 中。他们负责强化 E21WE43B 触变铸件，导致屈服强度为 190 MPa，压缩强度为 475 MPa，塑性为 13.1%。