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Hot Deformation Behavior and Processing Map of SiCp/2024Al Composite
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Hot Deformation Behavior and Processing Map of SiCp/2024Al Composite
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National Natural Science Foundation of China (51371077)

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    摘要:

    采用Gleeble-1500D熱模擬試驗(yàn)機(jī)，對30%SiCp/2024A1復(fù)合材料在溫度為350～500 ℃、應(yīng)變速率為0.01～10 s-1條件下進(jìn)行熱壓縮試驗(yàn)，研究該復(fù)合材料的熱變形行為與熱加工特征，建立熱變形本構(gòu)方程和加工圖。結(jié)果表明，30%SiCp/2024A1復(fù)合材料的流變應(yīng)力隨溫度升高而降低，隨應(yīng)變速率增大而升高，說明該復(fù)合材料是一個正應(yīng)變速率敏感的材料，其熱壓縮變形時的流變應(yīng)力可采用Zener-Hollomon參數(shù)的雙曲正弦形式來描述，在本實(shí)驗(yàn)條件下平均熱變形激活能Q為153.251 kJ/mol。為了證實(shí)其潛在的可加工性，對加工圖中的穩(wěn)定區(qū)和失穩(wěn)區(qū)進(jìn)行標(biāo)識，并通過微觀組織得到驗(yàn)證。綜合考慮熱加工圖和顯微結(jié)構(gòu)，變形溫度為450 ℃，應(yīng)變速率為 1 s-1是復(fù)合材料適宜的熱變形條件。

    Abstract:

    The hot deformation behavior of 30%SiCp/2024 aluminum alloy composites was studied by hot compression tests using Gleeble-1500D thermo-mechanical simulator at the temperatures ranging from 350~500 ℃ under strain rates of 0.01~10 s-1. The true stress-true strain curves were obtained in the tests. Constitutive equation and processing map were established. The results show that the flow stress decreases with the increase of deformation temperature at a constant strain rate, and increases with the increase of strain rate at constant temperature, indicating that composite is a positive strain rate sensitive material. The flow stress behavior of composite during hot compression deformation can be represented by a Zener-Hollomon parameter in the hyperbolic sine form. Its activation energy for hot deformation Q is 153.251 kJ/mol. To demonstrate the potential workability, the stable zones and the instability zones in processing map were identified and verified through micrographs. Considering processing map and microstructure, the hot deformation should be carried out at the temperature of 450 ℃ and the strain rate of 1 s-1.

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郝世明,謝敬佩,王愛琴,王文焱,李繼文. Hot Deformation Behavior and Processing Map of SiCp/2024Al Composite[J].稀有金屬材料與工程,2014,43(12):2912~2916.[Hao Shiming, Xie Jingpei, Wang Aiqin, Wang Wenyan, Li Jiwen. Hot Deformation Behavior and Processing Map of SiCp/2024Al Composite[J]. Rare Metal Materials and Engineering,2014,43(12):2912~2916.]
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  • 收稿日期:2014-03-15
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  • 在線發(fā)布日期: 2015-04-16
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