Affiliation:
1. Faculty of Engineering, Mining, Metallurgy and Petroleum Engineering, Al-Azhar University, Cairo 11884, Egypt
2. Department of Physical Metallurgy of Non-Ferrous Metals, The National University of Science and Technology “MISIS“, 119049 Moscow, Russia
Abstract
Low sensitivity to hot cracking is very important not only for casting but also for ingots of wrought alloys. Doping of Al-Cu-(Mg) alloys by eutectic forming elements provides an increasing resistance to hot cracking susceptibility, but it also leads to a decrease in plasticity. The quasi-binary alloys based on an Al-Cu-REM system with an atomic ratio of Cu/REM = 4 have a high solidus temperature, narrow solidification range and fine microstructure. The detailed investigation of microstructure, precipitation and hot deformation behavior, and mechanical properties of novel Al-Cu-Y-Mg-Cr-Zr-Ti-Fe-Si alloy was performed in this study. The fine Al8Cu4Y, needle-shaped Al11Cu2Y2Si2, compact primary (Al,Ti)84Cu6.4Y4.3Cr5.3 and Q (Al8Cu2Mg8Si6) phases were identified in the as-cast microstructure. Near-spherical coarse Al3(Zr,Y) and fine Al45Cr7 precipitates with a size of 60 nm and 10 nm were formed after 3 h of solution treatment at 580 °C. S′(Al2CuMg) precipitates with an average diameter of 140 nm, thickness of 6 nm and calculated volume fraction of 0.033 strengthened 36 HV during aging at 210 °C for 3 h. Three-dimensional hot processing maps demonstrated an excellent and stable deformation behavior at 440–540 °C and strain rates of 0.01–10 s−1. The rolled sheets had a good combination of yield strength (313 MPa) and plasticity (10.8%) in the recrystallized at 580 °C, with water quenched and aged at 210 °C for a 3 h state. The main calculated effect in the yield strength was contributed by Al45Cr7 precipitates.
Funder
Russian Science Foundation
Subject
General Materials Science,Metals and Alloys
Reference73 articles.
1. Zolotorevsky, V.S., Belov, N.A., and Glazoff, M.V. (2007). Casting Aluminum Alloys, Elsevier.
2. ASM International Handbook Committee (2001). ASM Handbook Volume 2: Properties and Selection—Nonferrous Alloys and Special-Purpose Materials, ASM.
3. Mechanical properties in the semi-solid state and hot tearing of aluminium alloys;Eskin;Prog. Mater. Sci.,2004
4. Determining hot cracking index of Al–Si–Cu–Mg casting alloys calculated using effective solidification range;Pozdniakov;Int. J. Cast Met. Res.,2014
5. Search for promising compositions for developing new multiphase casting alloys based on Al-Zn-Mg matrix using thermodynamic calculations and mathematic simulation;Zolotorevskii;Phys. Met. Metallogr.,2014
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献