Microstructureal Characterization and Mechanical Properties of Nanostructured Al-10Zn-3.0Mg-1.8Cu Alloy
7XXX series aluminum alloys have been extensively utilized in various industrial applications,such as automotive,aerospace,and medical industries due to their high specific strength.Up to now,there has been limited researches on improving the mechanical property of 7XXX series aluminum alloys by combining grain refinement and precipitation-hardening.In this study,the nanocrystalline Al-10Zn-3.0Mg-1.8Cu(wt%)alloy powders were prepared by cryomilling first,and then the bulk samples were fabricated by spark plasma sintering(SPS).The results showed that the pinnings of MgZn2 preciptation on the grain boundaries result in a high thermally stable grain size up to 0.78 TM(TM is the melting point of this alloy).The bulk nanostructured Al-10Zn-3.0Mg-1.8Cu alloy retains a fine-grained structure even after a solution treatment at 445℃ for 30 mins plus 470℃ for 30 mins.The ultimate compressive strength and true strain of the SPS-processed and heat-treated samples are 900 MPa and 20%,respectively.It is comfirmed that the high plasticity of the alloy is attributed to the coarse MgZn2 particles rather than work hardening.These coarse MgZn2 particles act as blocks for the prolongation of cracks.It has been confirmed that modifying the MgZn2 size and distribution through heat treatment can improve further the property of the nanostructured Al-10Zn-3.0Mg-1.8Cu alloy.
Al-Zn-Mg-Cu alloy nanostructure thermally stable mechanical property
Peng G.Y. Chen H.B. Chen J.S. Yang B.
Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Bei State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing, Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Bei
国际会议
北京
英文
1022-1025
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）