Effects of CNTs on microstructure and hardness of laser welds of the CNT-reinforced magnesium composite
作者： M. Qian , C.S. Goh , Y.H. Sun , F.L. Ng
DOI: 10.1016/J.COMPOSITESA.2013.01.013
关键词:
摘要: Abstract A magnesium composite reinforced with 1.3 wt.% multiwall carbon nanotubes (MWCNTs) was welded using a CO 2 laser. Abundant nanoscale and submicron particles formed in the laser welds, owing to coalescence of reinforcing CNTs as result conjoint effect irradiation welding thermal annealing. Dense intra- inter-granular particle-enveloped equiaxed dendrites matrix constituted characteristic weld microstructure. Lateral-irregular cellular growth originated from fusion boundary substructure center. It is inferred that affected solidification mainly via retarding rate. The gained hardening primarily attributed local refined microstructure locally denser MWCNTs. Lower fluence facilitated finer structure less on hence more effect.
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