放电等离子体烧结Al-4.5Cu合金的组织与性能

doi:10.19976/j.cnki.43-1448/TF.2021088

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Abstract Al-4.5Cu (mass fraction, %) alloy was prepared by spark plasma sintering (SPS) followed by solution, quenching and aging. The X-ray diffraction, scanning electron microscopy, transmission electronmicroscopy and tensile tests were carried out. The effect of interparticle boundary (IPB) and precipitation behavior on mechanical properties of the Al-4.5Cu alloy were investigated in detail. The results show that the IPB consists of Al₂O₃nanoparticles, CuAl₂ phase and residual nanopores. After T6 aging, coarse CuAl₂phases with a diameter of 150-600 nm precipitate at the IPB, and the precipitation free zone (PFZ) with a width of 40-60 nm is formed. An improvement of yield strength and ultimate tensile strength from 95 MPa and 229 MPa to 280 MPa and 378 MPa is achieved respectively after T6 aging, while the elongation to fracture decreases from 11.8% to 6%. The increase in strength is mainly due to the well dispersion of precipitates and the densification of the material during T6 aging. The decrease in plasticity may result from the earlier plastic deformation in the PFZ during tensile deformation, leading to the accumulation of dislocations from PFZ to CuAl₂ phase nearby the IPB, as a result, stress concentrationis formed, which consequently promotes cracksexp and along the IPB and decreases the ductility of the material.

Key words： powder metallurgy interparticle boundary precipitation microstructure mechanical properties

Received: 25 October 2021 Published: 28 February 2022

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	MU Dikunqi
	CAO Lei
	ZHANG Zhen
	LIANG Jiamiao
	ZHANG Deliang
	WANG Jun

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MU Dikunqi,CAO Lei,ZHANG Zhen, et al. The microstructure and mechanical properties ofAl-4.5Cu alloy fabricated by spark plasma sintering[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(1): 24-33.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2021088 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I1/24

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