郑州大学学报（理学版）

以工业纯铝、2种不同含钛量的电解低钛铝等为原料,在实验室条件下制备了3种不同钛含量的A356铝合金,对这3种合金在高速加载条件下的动态断裂韧性进行了测试研究.结果表明,在所试验的温度范围内,3种合金均表现为脆性断裂特征,动态断裂韧性随钛含量的增加而增加,特别是当钛质量分数在0.20%以上时表现得更为明显,合金的低温动态断裂韧性均优于室温动态断裂韧性,当温度达到95℃时,所有合金的动态断裂韧性达到峰值,当温度超过150℃时,动态断裂韧性均显著下降,并且不同合金的动态断裂韧性差别缩小,电解加钛方式和通过含钛中间合金加钛方式对合金的动态断裂韧性没有明显影响.

Three types of A356 alloys with different Ti contents are prepared in the laboratory.The dynamic fracture toughness(DFT) of the alloys is tested under the condition of high speed loading.The results show that within the testing temperature,the alloys display the characteristic of brittle fracture.The DFT of the alloys increases with increasing Ti content of the alloys,especially when Ti content is higher than 0.20%.The DFT of the alloys in low temperature are all better than those in the room temperature.When the testing temperature is 95℃,the DFT of all the alloys reaches up to their peak values.But when the testing temperature is higher than 150℃,the DFT of the alloys decreases obviously,and the differences of the DFT for different alloys decrease.There is no obvious influence on the DFT of the alloys with Ti addition by electrolysis and by Al-Ti master alloy.