TY - JOUR
T1 - 放电等离子体烧结Al-4.5Cu合金的组织与性能
AU - Mu, Dikunqi
AU - Cao, Lei
AU - Zhang, Zhen
AU - Liang, Jiamiao
AU - Zhang, Deliang
AU - Wang, Jun
N1 - Publisher Copyright:
© 2022, Editorial Office of Materials Science and Engineering of Powder Metallurgy. All right reserved.
PY - 2022/2
Y1 - 2022/2
N2 - 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 Al2O3 nanoparticles, CuAl2 phase and residual nanopores. After T6 aging, coarse CuAl2 phases 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.
AB - 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 Al2O3 nanoparticles, CuAl2 phase and residual nanopores. After T6 aging, coarse CuAl2 phases 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.
KW - Interparticle boundary
KW - Mechanical properties
KW - Microstructure
KW - Powder metallurgy
KW - Precipitation
UR - http://www.scopus.com/inward/record.url?scp=85125261785&partnerID=8YFLogxK
U2 - 10.19976/j.cnki.43-1448/TF.2021088
DO - 10.19976/j.cnki.43-1448/TF.2021088
M3 - 文章
AN - SCOPUS:85125261785
SN - 1673-0224
VL - 27
SP - 24
EP - 33
JO - Fenmo Yejin Cailiao Kexue yu Gongcheng/Materials Science and Engineering of Powder Metallurgy
JF - Fenmo Yejin Cailiao Kexue yu Gongcheng/Materials Science and Engineering of Powder Metallurgy
IS - 1
ER -