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首页> 外文期刊>Materials Science and Engineering >The influence of Cu-15P master alloy on the microstructure and tensile properties of Al-25 wt% Mg_2Si composite before and after hot-extrusion
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The influence of Cu-15P master alloy on the microstructure and tensile properties of Al-25 wt% Mg_2Si composite before and after hot-extrusion

机译：Cu-15P中间合金对Al-25 wt％Mg_2Si复合材料热挤压前后的组织和拉伸性能的影响

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摘要

This study was undertaken to investigate the effect of Cu-P master alloy on the microstcucture and tensile properties of hot extruded Al-25 wt% Mg_2Si in-situ metal matrix composite. Cu-15wt% P master alloy was added to produce different levels of P (0-3 wt%) in the composite. Then, these small billets were hot extruded by using a hydraulic press at a ram speed of 1 mm/s with the extrusion ratio of 6:1 at 500 °C. Microstructural examinations were carried out by using optical and scanning electron microscopy (SEM). The results showed that P addition changes the morphology of primary Mg_2Si from large dendritic to polyhedral shape and its average particle size decreases from 220 urn to 22 urn in as-cast condition. Microstructural studies also showed that extrusion process not only refines the primary Mg_2Si particles, but also fragments intermetallic phases to fine particles. Tensile testing results also revealed that the optimum P level for the improvement of both ultimate tensile strength and elongation values of hot-extruded specimens is 1 wt%. The examination of fracture surfaces via scanning electron microscopy (SEM) revealed a transition from brittle fracture in as-cast to ductile fracture in hot-extruded and P-modified specimens. This can be attributed to the changes in the size and morphology of intermetallics and reduction in pore size after hot-extrusion.
机译：本研究旨在研究Cu-P中间合金对热挤压Al-25 wt％Mg_2Si原位金属基复合材料的微观组织和拉伸性能的影响。加入Cu-15wt％的P中间合金以在复合物中产生不同水平的P（0-3wt％）。然后，使用液压机以1 mm / s的冲头速度在500°C下以6：1的挤压比对这些小坯料进行热挤压。通过使用光学和扫描电子显微镜（SEM）进行微观结构检查。结果表明，磷的添加将铸态条件下的初生Mg_2Si形态从大的树枝状转变为多面体，其平均粒径从220 urn减小到22 urn。显微组织研究还表明，挤压工艺不仅可以细化初级Mg_2Si颗粒，而且还可以将金属间相破碎为细颗粒。拉伸试验结果还表明，用于改善热挤出样品的极限抗拉强度和伸长率值的最佳P水平为1wt％。通过扫描电子显微镜（SEM）检查断裂表面，发现在热挤压和P改性试样中，铸态的脆性断裂转变为延性断裂。这可以归因于金属间化合物的尺寸和形态的变化以及热挤压后孔径的减小。

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