Al/Al2O3复合材料伪半固态触变模锻成形

在粉末成形的基础上，结合金属半固态加工技术提出了金属/陶瓷复合材料伪半固态触变模锻成形工艺，并成功制备出 Al/Al₂O₃复合材料杯形件。微观组织观察及力学性能分析表明制件微观组织致密、力学性能优异。当铝体积分数增加到37%时，不同成形压力下复合材料制件抗弯强度可达430~690 MPa，断裂韧性达8.5~16.8 MPa·m1/2，与原位反应及高温氧化工艺相比抗弯强度及断裂韧性大幅度提高。同时分析了成形温度、成形压力等工艺参数对制件性能的影响。研究结果证明采用该工艺成形金属/陶瓷复合材料是可行的。

Thixo-die-forging of Al/Al_2O_3 composite in pseudo-semi-solid state

A new technology, thixo-die-forging of composite in pseudo-semi-solid state was proposed based on powder metallurgy technology combing with semi-solid metal process, and the cup shell with Al/Al_2O_3 composite was prepared successfully. The metallographie analysis and performance test show that the microstructure of Al/Al_2O_3 is dense and mechanical properties are excellent. The bend strength and fracture toughness of the composite are about 430～690 MPa and 8. 5～16. 8 MPa· m~(1/2) respectively, in which the volume fraction of Al is 37% under different pressures. Comparing with reaction in situ and high temperature oxidation technologies, the bending strength and fracture toughness improve greatly. At the same time it shows that the technology parameters have great influences on the properties, for example, forming temperature, pressure, etc. All the results prove that this new technology is feasible for the metal/ceramics composites.