【摘要】 在生产工业纯铝的电解槽添加 Ti O2 ,直接电解得到含钛量低于 0 .3%的电解低钛铝合金 ,用它替代工业纯铝熔配含钛的 ZL 10 8合金 ,记作 ZL 10 8Ti.分别熔配 ZL 10 8和 ZL 10 8Ti两种合金 ,用金属模具浇铸三点弯曲试样 ,并采用相同的热处理和机加工工艺制备对比试验的试样 .在 MTS810型材料试验机上测量两种合金的平面应变断裂韧度 ,分别得到 ZL 10 8合金的 KIC=(18.9± 0 .6 ) MPa· m1 / 2 ,ZL 10 8Ti的 KIC=(2 0 .0± 0 .5 ) MPa· m1 / 2 .试验结果经 t分布的显著性检验确认 :电解加钛改进了 ZL 10 8合金的断裂韧性 .金相分析进一步揭示了电解加钛细化晶粒 ,使 ZL 10 8合金增韧的微观机理 .更多还原

【Abstract】 The electrolytic low-titanium aluminum alloy of Ti contain m(Ti)≤0.3% is produced directly by adding TiO 2 in the industrial electrolytic tank of pure aluminum. It is used in place of pure aluminum to prepare the alloy ZL108 containing Ti and named as ZL108 Ti.Fusion alloying ZL108 and ZL108 Ti respectively, running castings of the three-points bend SE(B) specimens in metal mould, and adopting the same heat-treating and machining technology, two groups of specimens are prepared for comparative tests. The plane-strain fracture toughness of the two alloys is tested on MTS810 material testing system,and the results are K IC =(18.9±0.6) MPa·m 1/2 for the alloy ZL108 and K IC =(20.0±0.5) MPa·m 1/2 for the alloy ZL108 Ti.Based on the significance test of t distribution for the results,it is confirmed that the fracture toughness of the alloy ZL108 is improved effectively by adding titanium in electrolysis. The further metallographic structure analyses reveal the micro mechanism of improving the fracture toughness of the alloy ZL108 by adding titanium in electrolysis to refine the grains.更多还原