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Effect of squeeze casting process on microstructures and flow stress behavior of Al-17. 5Si-4Cu-0. 5Mg alloy
Alternative TitleEffect of squeeze casting process on microstructures and flow stress behavior of Al-17.5Si-4Cu-0.5Mg alloy
Shi Yuanji; Liu Lanji; Zhang Lei; Zhang Lijun; Zheng Li; Li Runxia; Yu Baoyi
2017
Source PublicationJOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
ISSN1006-706X
Volume24Issue:9Pages:957-965
AbstractThe 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 degrees 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 alpha-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 degrees C. Flow stress behavior of Al-17. 5Si-4Cu-0. 5Mg alloy can he 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.
Other AbstractThe 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 ℃ 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 a-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 ℃. 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.
KeywordMECHANICAL-PROPERTIES CONSTITUTIVE-EQUATIONS ALUMINUM-ALLOY STRAIN-RATE AL-ALLOY TEMPERATURE PARTICLES STEEL Squeeze casting Al-Si-Cu-Mg alloy Hot compression deformation Flow stress Constitutive equation
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China] ; [Shenyang City Application Basic Research Foundation]
CSCD IDCSCD:6077477
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/148411
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
Shi Yuanji,Liu Lanji,Zhang Lei,et al. Effect of squeeze casting process on microstructures and flow stress behavior of Al-17. 5Si-4Cu-0. 5Mg alloy[J]. JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,2017,24(9):957-965.
APA Shi Yuanji.,Liu Lanji.,Zhang Lei.,Zhang Lijun.,Zheng Li.,...&Yu Baoyi.(2017).Effect of squeeze casting process on microstructures and flow stress behavior of Al-17. 5Si-4Cu-0. 5Mg alloy.JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,24(9),957-965.
MLA Shi Yuanji,et al."Effect of squeeze casting process on microstructures and flow stress behavior of Al-17. 5Si-4Cu-0. 5Mg alloy".JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL 24.9(2017):957-965.
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