Effect of zirconium on microstructures and mechanical properties of squeeze cast Al–5.0Cu–0.4Mn–0.1Ti–0.1RE alloy

Abstract

Al–5.0Cu–0.4Mn alloys with different Zr additions have been prepared by direct squeeze casting. The effects of Zr on microstructures and mechanical properties of the as-cast and T6 heat-treated alloys were investigated by tensile test, optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the optimal tensile property of the as-cast alloy occurs at the Zr content of 0.15% (mass fraction) due to the “Zr poisoning” action and the appearance of bulky primary Al₃Zr, which decreases the grain refinement strengthening effect of the as-cast alloy. The peak values of ultimate tensile strength and yield strength of the T6 alloy occur at the Zr content of 0.25%, and that of the elongation occurs at Zr content of 0.05%. This is mainly attributed to the strengthening effect of dispersed precipitation of Al₃Zr and θ’ phases. The optimal mechanical properties of T6 heat-treated alloy are the tensile strength of 429 MPa, the yield strength of 327 MPa and the elongation of 18%, respectively when the squeeze pressure is 100 MPa and Zr content is 0.25%.

Keywords

Zr / squeeze pressure / mechanical property / microstructure

References

[1] LiY-x, NgaiT-w, ZhaoH-d, ZhangW-w, LiY-yuan. Microstructure and properties of squeeze cast Al-Cu alloy with different applied pressure [J]. Foundry, 2005, 54(8): 764-766

[2] BaiZ-h, ZhaoN, LuoB-hui. The effects of squeeze casting on the properties of Al-Cu alloy [J]. Light Alloy Fabrication Technology, 2002, 30(5): 17-18

[3] ZhangM, ZhaoH-d, ZhangW-w, LuoZ-q, LiY-yuan. Processing and properties of Al-Cu-Mn supporting frame by indirect squeeze casting [J]. Journal of South China University of Technology: Natural Science Edition, 2007, 35(3): 16-21

[4] MahmudiR, SepehrbandP, GhasemiH M. Improved properties of A319 aluminum casting alloy modified with Zr [J]. Materials Letters, 2006, 60: 2606-2610

[5] YuanW-h, LingZ-yu. Effect of Zr addition on properties of Al-Mg-Si aluminum alloy used for all aluminum alloy conductor [J]. Materials and Design, 2011, 32: 4195-4200

[6] WangX, ChenG-q, LiB, WuL-m, JiangD-ming. Effects of Sc, Zr and Ti on the microstructure and properties of Al alloys with high Mg content [J]. Rare Metals, 2010, 29: 66-71

[7] CasariD, LudwigT H, MerlinM, AmbergL, GaragnaniG L. The effect of Ni and V trace elements on the mechanical properties of A356 aluminium foundry alloy in as-cast and T6 heat treated conditions [J]. Materials Science & Engineering A, 2014, 610: 414-426

[8] LaiJ-p, JiangR-p, LiuH-s, DunX-l, LiY-f, LiX-qian. Influence of cerium on microstructures and mechanical properties of Al-Zn-Mg-Cu alloys [J]. Journal of Central South University, 2012, 19(4): 869-874

[9] ChenQ, PanQ-l, WangY, ZahngZ-y, ZhouJ, LiuChang. Microstructure and mechanical properties of Al-5.8Mg-Mn-Sc-Zr alloy after annealing treatment [J]. Journal of Central South University, 2012, 19(7): 1785-1790

[10] HeY-d, ZhangX-m, YouJ-hai. Effects of minor contents of Sc and Zr on microstructure and mechanical properties of Al-Zn-Mg-Cu Alloy [J]. Rare Metal Materials and Engineering, 2007, 36(4): 665-670

[11] SunL-m, YuH-s, MinG-h, ZhangJing. Effects of Zr on microstructure and properties of Al-Zn-Mg-Cu alloy [J]. Special Casting & Nonferrous Alloys, 2007, 27(5): 380-381

[12] ZhaoZ-h, WangG-s, ZhangY-h, CuiJ-zhong. Effects of Sc and Zr on microstructure and mechanical properties of Al-Zn-Mg-Cu Aluminum Alloy [J]. Journal of Northeastern University: Natural Science, 2011, 32(11): 1574-1577

[13] JiaZ-h, CouzinieJ P, CherdoudiN, GuillotI, ArnbergL. Precipitation behavior of Al3Zr precipitate in Al-Cu-Zr and Al-Cu-Zr-Ti-V alloys [J]. Trans Nonferrous Met Soc China, 2012, 22: 1860-1865

[14] ZhangY-y, DengY-l, WanL, ZhangX-ming. Effects of precipitation of Al3Zr particles on microstructures, textures and properties of Al-Zn-Mg-Cu alloy hot-rolled plate [J]. The Chinese Journal of Nonferrous Metals, 2012, 22(2): 358-364

[15] SepehrbandP, MahmudiR, KhomamizadehF. Effect of Zr addition on the aging behavior of A319 aluminum cast alloy [J]. Scripta Materialia, 2005, 52: 253-257

[16] ZhengQ, YangC, WangS, YuA, ChenH, HeY. Effect of compound inoculants Ti and Zr on as cast microstructure and mechanical properties of Al–Cu alloy [J]. Materials Research Innovations, 2014, 18(2): 59-63

[17] PengY-y, YinZ-m, NieB, ZhongLi. Effect of minor Sc and Zr on superplasticity of Al-Mg-Mn alloys [J]. Trans Nonferrous Met Soc China, 2007, 17: 744-750

[18] YinZ-m, GaoY-z, PanQ-l, ZhangY-h, YinS-bo. Effect of trace Sc and Zr on Grain refinement of as-cast Al-Mg alloys [J]. The Chinese Journal of Nonferrous Metals, 1997, 7(4): 75-78

[19] BunnA M, SchumacherP, KeamsM A, BoothroydC B, GreerA L. Grain refinement by Al–Ti–B alloys in aluminium melts: a study of the mechanisms of poisoning by zirconium [J]. Materials Science and Technology, 1999, 15(10): 1115-1123

[20] JonesG P, PearsonJ. Factors affecting the grain-refinement of aluminum using titanium and boron additives [J]. Metallurgical Transactions B, 1976, 7(2): 223-234

[21] LiuH, GaoY-p, QiL, WangY-z, NieJ-feng. Phase-field simulation of Orowan strengthening by coherent precipitate plates in an aluminum alloy [J]. Metallurgical and Materials Transactions A, 2015, 46: 3287-3301