Simulation study of block press molding of Al-Fe metals with different morphologies
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摘要: 文章以含40%Al 的Al-Fe复合金属为研究对象，对颗粒状和屑状40Al-Fe复合金属分别进行压制预变形，并对屑状40Al-Fe复合金属预制坯进行了二次热压缩变形，重点研究压制预变形及二次热压缩对Al-Fe复合金属成形性和界面影响。结果表明：压力为16 MPa时，颗粒状40Al-Fe复合金属预制坯（密度为4.54 g/cm3）成形性良好且形成致密界面；压力为16 MPa时，屑状40Al-Fe复合金属预制坯（密度为3.50 g/cm3）可以成形但界面存在孔洞，Al屑主要为“片层状”“狗牙状”“圆圈状”“波浪状”，其经二次热压缩变形，“圆圈状”Al屑连成一个整体，“狗牙状”与“波浪状”Al屑均演变为“片层状”，而Fe屑仍为“片层状”“块状”，未发生明显变形。变形温度300 ℃、变形速率0.5 s−1、变形程度0.1是目前生产工艺最佳参数，此时屑状40Al-Fe复合金属成形性最佳且界面结合良好（密度为4.66 g/cm3）。
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关键词:
- 压制成形 /
- Al-Fe 复合金属 /
- 界面
Abstract: In this paper, the Al-Fe composite metal containing 40% of Al is taken as the research object, and the granular 40Al-Fe composite metal and chip Al-Fe composite metal are pressed and predeformed respectively, focusing on the second hot compression deformation of the chip Al-Fe composite metal preformed billet, to study the effect of pressing predeformation and hot compression on the formability and interface of Al-Fe composite metal. The results show that the granular 40Al-Fe composite metal preforms (density of 4.54 g/cm3) at a pressure of 16 MPa have good formability and form a dense interface. Pressure of 16 MPa when the chip-like 40Al-Fe composite metal prefabricated billet (density of 3.50 g/cm3) can be molded but there are holes in the interface, Al chips are mainly “lamellar”, “dogtooth”, “circle”, “wave”, after the second hot compression deformation “circle” Al chips into a whole, “dogtooth” and “wavy”, “dogtooth” and “wavy”. “Circle-like”, “wave-like”, after the second thermal compression deformation “circle-like” Al shavings connected to a whole, “dogtooth-like” and “wave-like” Al shavings, “dogtooth-like” and “wave-like” Al shavings, “dogtooth-like” and “wave-like” Al shavings. “Wave-like” Al chips are evolved into “lamellar”, after the second thermal compression deformation Fe chips are still “lamellar”, “blocky”, without obvious deformation occurs. The deformation temperature of 300 ℃, deformation rate of 0.5 s−1, and the degree of deformation of 0.1 are the best parameters of the current production process, at which time the shavings of 40Al-Fe composite metal have the best formability and good interfacial bonding (density of 4.66 g/cm3).-
Key words:
- press forming /
- Al-Fe composite metals /
- interface
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图 10 ε=0.1、T=300 ℃，变形速率$ \dot{\mathit{\varepsilon }} $=0.5、1、2 s−1时屑状40Al-Fe复合金属应力应变曲线
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