【摘要】 针对亚共晶Al-Si合金中粗大α-Al枝晶和Si致细化"中毒"难题,研制出一种抗Si"中毒"的AlTiC-B晶种合金。本工作研究了该晶种合金对ZL114铝合金微观组织和力学性能的影响,通过X射线衍射仪、场发射扫描电子显微镜、布氏硬度计和万能试验机对ZL114铝合金进行了微观组织分析和力学性能测试。结果表明,加入质量分数为0.3%、0.6%和1.0%的AlTiC-B晶种合金后,ZL114合金粗大的α-Al枝晶得到了显著细化,晶粒尺寸由1 224μm分别细化至186μm、122μm和116μm;室温屈服强度从250 MPa分别提升至295 MPa、340 MPa和345 MPa,分别提高了18.0%、36.0%和38.0%。力学性能的提高主要归因于α-Al枝晶的细化,以及细化后共晶Si分布的均匀化。更多还原

【Abstract】 In terms of the coarse α-Al dendrites and refinement ‘poisoning’ problems in hypoeutectic Al-Si alloys, an anti Si ‘poisoning’ AlTiC-B master alloy has been successfully developed. This work studied the influence of the master alloy on the microstructure and mechanical properties of ZL114 aluminum alloy. The microstructure analysis and mechanical properties of ZL114 aluminum alloy were carried out by X-ray diffractometer, scanning electron microscope, Brinell hardness tester and universal testing machine. The results show that the α-Al grains of ZL114 alloy are significantly refined after adding 0.3 wt%, 0.6 wt% and 1.0 wt% of AlTiC-B inoculation alloy. The average grain size drops from 1 224 μm to 186 μm, 122 μm, and 116 μm respectively; the room temperature yield strength increases from 250 MPa to 295 MPa, 340 MPa and 345 MPa, an increase of 18.0%, 36.0% and 38.0% respectively. The improvement of mechanical properties is mainly due to the refinement of α-Al dendrites and the homogenization distribution of eutectic Si after refinement.更多还原