Effect of Shaft Shoulder Diameter on Properties of Vanadium Titanium Nickel Hydrogen Storage Alloy Modified by Friction Stirring
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摘要: 采用不同轴肩直径进行了V3TiNi0.56钒钛镍储氢合金的搅拌摩擦改性试验,并进行了显微组织和充放电循环稳定性的测试与对比分析。结果表明:搅拌摩擦改性明显细化了合金内部晶粒,提高了合金的充放电循环稳定性。当轴肩直径范围在8~12 mm时,合金的平均晶粒尺寸和放电容量衰减率均先减小后增大,合金的充放电循环稳定性先提高后下降。与未经搅拌摩擦改性试样相比,采用轴肩直径10 mm搅拌头进行搅拌摩擦改性时合金的平均晶粒尺寸减小48%、放电容量衰减率下降24个百分点。Abstract: Friction stirring modification experiments of V3TiNi0.56 hydrogen storage alloy with different shoulder diameters were carried out,and the microstructures and charge-discharge cycle stability were tested and compared.The results show that friction stirring modification can refine the grain size and improve the cycle stability of the alloy.When the shoulder diameter is at 8～12 mm,the average grain size and discharge capacity decay rate of the alloy decrease first and then increase,and the charge-discharge cycle stability of the alloy increases first and then decreases.Compared with the specimens without friction stirring modification,the average grain size of the alloy decreases by 48% and the discharge capacity decay rate decreases by 24% when the stirring head with a diameter of 10 mm is used for friction stirring modification.
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