|
|
|
| Effect of squeeze casting process on microstructures and flow stress behavior of Al-17.5Si-4Cu-0.5Mg alloy |
| Yuan-ji Shi,Lan-ji Liu,Lei Zhang,Li-jun Zhang,Li Zheng,Run-xia Li,Bao-yi Yu* |
| School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China |
|
|
|
|
Abstract The effects of squeeze casting process on microstructure and flow stress behavior of Al-17.5Si-4Cu-0.5Mg alloy were investigated and the hot-compression tests of gravity casting and squeeze casting alloy were carried out at 350-500��C and 0.001-5 s-1. The results show that microstructures of Al-17.5Si-4Cu-0.5Mg alloys were obviously improved by squeeze casting. Due to the decrease of coarse primary Si particles, soft ��-Al dendrite as well as the fine microstructures appeared, and the mechanical properties of squeeze casting alloys were improved. However, when the strain rate rises or the deformation temperature decreases, the flow stress increases and it was proved that the alloy is a positive strain rate sensitive material. It was deduced that compared with the gravity casting alloy, squeeze casting alloy (solidified at 632 MPa) is more difficult to deform since the flow stress of squeeze casting alloy is higher than that of gravity casting alloy when the deformation temperature exceeds 400��C. Flow stress behavior of Al-17.5Si-4Cu-0.5Mg alloy can be described by a hyperbolic sine form with Zener-Hollomon parameter, and the average hot deformation activation energy Q of gravity casting alloy and squeeze casting alloy is 278.97 and 308.77 kJ/mol, respectively.
|
|
Received: 06 December 2016
Published: 27 September 2017
|
| Fund:Research on strengthening mechanism of short heat treatment for semi-solid forming hypereutectic Al-Si-Cu-Mg alloys |
|
Corresponding Authors:
runxia li
E-mail: 5327368@qq.com
|
|
|
|
| [1] |
Zong-ye Ding,Di Zhang,Qiao-dan Hu,,*,Long Zeng,Jian-guo Li,. Constitutive analysis and optimization on hot working parameters of as-cast high Cr ultra-super-critical rotor steel with columnar grains[J]. Chinese Journal of Iron and Steel, 2017, 24(9): 916-924. |
| [2] |
Yang Yun,Qing-wu Cai,,Bao-sheng Xie,*,Shuang Li. Effect of tempering temperature on strain hardening exponent and flow stress curve of 1000 MPa grade steel for construction machinery[J]. Chinese Journal of Iron and Steel, 2017, 24(9): 950-956. |
| [3] |
Zhao-xia Shi,,*,Xiao-feng Yan,Chun-hua Duan,Jin-gui Song,Ming-han Zhao,Jue Wang. Hot deformation behavior of GH4945 superalloy using constitutive equation and processing map[J]. Chinese Journal of Iron and Steel, 2017, 24(6): 625-633. |
| [4] |
Ying Bao,,Dong-ye Yang,Na Liu,Guo-qing Zhang,Zhou Li,Fu-yang Cao,*,Jian-fei Sun,**. High temperature deformation behavior and processing map of hot isostatically pressed Ti-47.5Al-2Cr-2Nb-0.2W-0.2B alloy using gas atomization powders[J]. Chinese Journal of Iron and Steel, 2017, 24(4): 435-441. |
| [5] |
Lei Wang,Di Tang*,Yong Song. Prediction of mechanical behavior of ferrite-pearlite steel[J]. Chinese Journal of Iron and Steel, 2017, 24(3): 321-327. |
| [6] |
Hong��bin LI,,Yun��li FENG,Tao YAN,En��lin YU. Constitutive Model of Warm Deformation Behavior of Medium Carbon Steel[J]. Chinese Journal of Iron and Steel, 2016, 23(9): 940-948. |
|
|
|
|
2017, Vol. 24 
