摘要
研究了特殊体育器材用2A12铝合金疲劳裂纹的扩展机制。结果表明,在裂纹萌生阶段,微裂纹沿晶扩展,扩展后期微裂纹变为穿晶扩展。试样的断面裂纹成核粒子的长度和宽度较大时,疲劳寿命较短。
The fatigue crack propagation mechanism of the alumi num alloy 2A12 used in special sports equipment was investigated. The results show that the micro cracks extend along grain boundary at the initiation stage of the cracks, and then the micro cracks change to transgranular propagation at the later stage. The fatigue life is short when the length and width of the nucleation particle at the fractography crack are large.
引文
[1]刘韬,陈荣发,潘毅,等.金属型重力铸造2A14铝合金应力场仿真与裂纹控制研究[J].铸造技术,2012,33(11):1298-1301.
[2]樊富友,陈明,于晓艳,等.大型薄壁铝合金舱体铸件裂纹分析及试验研究[J].铸造技术,2013,34(2):196-199.
[3]郭志宏,秦忆波,屈淑维,等.基于Anycasting的挤压铸造镁合金试样力学性能研究[J].特种铸造及有色合金,2010(11):1455-1457.
[4]林小瑛,卢月美,李树江,等.铝合金铸件移动磁场铸造的铸造缺陷及防止[J].福州大学学报(自然科学版),2009(2):1298-1301.
[5]李伟,从保强,齐铂金,等.2A14-T6铝合金复合超高频脉冲方波变极性GTAW焊缝成形特征[J].焊接学报,2012(10):1804-1805.