挤压铸造工艺对Al-17.5Si-4Cu-0.5Mg合金组织及流变应力行为的影响

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-09-01 DOI:10.1016/S1006-706X(17)30139-5
Yuan-ji Shi, Lan-ji Liu, Lei Zhang, Li-jun Zhang, Li Zheng, Run-xia Li, Bao-yi Yu
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引用次数: 7

摘要

研究了挤压铸造工艺对Al-17.5Si-4Cu-0.5 Mg合金组织和流变应力行为的影响,并进行了重力铸造和挤压铸造合金在350 ~ 500℃、0.001 ~ 5 s-1条件下的热压缩试验。结果表明:挤压铸造能明显改善Al-17.5Si-4Cu-0.5 Mg合金的显微组织;挤压铸造合金的力学性能得到改善,挤压铸造合金中粗晶Si减少,α-Al枝晶变软,组织细化。当应变速率升高或变形温度降低时,流变应力增大,证明该合金为应变速率正敏感材料。结果表明:与重力铸造合金相比,在632 MPa下凝固的挤压铸造合金在变形温度超过400℃时,其流变应力要大于重力铸造合金,因此挤压铸造合金的变形难度更大。Al-17.5Si-4Cu-0.5Mg合金的流变应力行为可以用带有Zener-Hollomon参数的双曲正弦曲线来描述,重力铸造合金和挤压铸造合金的平均热变形激活能Q为278。分别为97和308.77 kJ/mol。
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Effect of squeeze casting process on microstructures and flow stress behavior of Al-17.5Si-4Cu-0.5Mg alloy

The effects of squeeze casting process on microstructure and flow stress behavior of Al-17.5Si-4Cu-0.5 Mg 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-0.5 Mg alloys were obviously improved by squeeze casting. Due to the decrease of coarse primary Si particles, soft α-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.

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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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