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- 2018
激光选区熔化成形原位自生TiB2/Al-Si复合材料的微观组织和力学性能
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Abstract:
利用激光选区熔化（SLM）技术制备了原位自生TiB2纳米陶瓷颗粒增强Al-Si基复合材料，并对成形后的TiB2/Al-Si复合材料进行不同的热处理。通过XRD物相分析、SEM微观组织观察、电子背散射衍射（EBSD）、EDS元素扫描分析和力学拉伸试验等对TiB2/Al-Si复合材料的微观组织进行观察和力学性能测试。研究表明，在原位自生TiB2纳米陶瓷颗粒和SLM快速凝固特性的共同作用下，SLM成形的原位自生TiB2/Al-Si复合材料具有超细晶结构，平均晶粒尺寸为1.1 μm；TiB2/Al-Si复合材料的力学性能优异，屈服强度为262 MPa，抗拉强度为435 MPa，延伸率为11.88%。对比经不同热处理的TiB2/Al-Si复合材料，直接时效处理（150℃/12 h）的TiB2/Al-Si复合材料性能最优，抗拉强度达到488 MPa，提高了53 MPa，延伸率降低至7.2%。 TiB2/Al-Si composite samples were produced by selective laser melting (SLM), following by different heat treatments. The microstructures and mechanical properties of in-situ TiB2/Al-Si composites before and after different heat treatments were analyzed by XRD, SEM, electron back-scattered diffraction (EBSD), EDS and tensile tests. The results indicate that the as-prepared SLM TiB2/Al-Si composites have ultra-fine microstructures and high mechanical properties due to the high cooling rate of SLM and the existence of nano TiB2 particles. The average grain size is 1.1 μm, and TiB2/Al-Si composites show high yield strength of 262 MPa, high tensile strength of 435 MPa and excellent elongation of 11.88%. For the TiB2/Al-Si composites after different heat treatments, the mechanical properties reach its best after the direct artificial aging (150℃/12 h). The tensile strength of the TiB2/Al-Si composites reaches 488 MPa which increases by 53 MPa, and the elongation decreases to 7.2%. 国家重点研发计划（2016YFB1100100）
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