• Chinese Journal of Lasers
  • Vol. 45, Issue 5, 502004 (2018)
Wang Xin1、2, Liu Dong1、2, and Cheng Xu1、2、*
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    DOI: 10.3788/CJL201845.0502004 Cite this Article Set citation alerts
    Wang Xin, Liu Dong, Cheng Xu. Effect of Heat Treatment Process on Microstructures and Mechanical Properties of Laser Additive Manufactured Al-Li Alloys[J]. Chinese Journal of Lasers, 2018, 45(5): 502004 Copy Citation Text show less

    Abstract

    The Al-Li alloy plates are fabricated by the laser additive manufacturing technique and the evolution of precipitation phase and the change of mechanical properties during the heat treatment process of Al-Li alloys are analyzed. The results show that the as-deposited microstructures of Al-Li alloys mainly consist of α(Al) matrix and TB(Al7Cu4Li) phase, and there exists a small amount of copper-rich phase in the grain boundary. After annealing, the TB phase is more evenly distributed inside the grains, where the copper-rich phase almost disappears and the Al-Cu-Fe impurity phase is rarely present in the grain boundary. After solid solution quenching, the TB phase is nearly dissolved in the matrix and a small amount of δ′(Al3Li) phase appears. After aging, numerous θ′(Al2Cu) and σ(Al5Cu6Mg2) are mainly precipitated. After heat treatment, the microhardness and tensile strength of Al-Li alloys are increased by 47.6% and 87.7%, respectively, if compared with those of as-deposited alloys.
    Wang Xin, Liu Dong, Cheng Xu. Effect of Heat Treatment Process on Microstructures and Mechanical Properties of Laser Additive Manufactured Al-Li Alloys[J]. Chinese Journal of Lasers, 2018, 45(5): 502004
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