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鍛造方式對(duì)7075鋁合金鍛件動(dòng)態(tài)再結(jié)晶的影響
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TG146.2

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國家重點(diǎn)基礎(chǔ)項(xiàng)目(G1999064908-04)


The Influence of Forge Mode on Dynamic Recrystallization for 7075 Aluminum Alloy during Forging
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    摘要:

    利用金相(OM)、透射電鏡(TEM)對(duì)7075鋁合金熱變形顯微組織進(jìn)行了觀察。實(shí)驗(yàn)表明：在熱鍛條件下，7075鋁合金完全可以發(fā)生動(dòng)態(tài)再結(jié)晶并通過動(dòng)態(tài)再結(jié)晶產(chǎn)生細(xì)小的再結(jié)晶晶粒。動(dòng)態(tài)再結(jié)晶的方式為不連續(xù)動(dòng)態(tài)再結(jié)晶，形核機(jī)制為亞晶轉(zhuǎn)動(dòng)、聚合形核；其臨界應(yīng)變值和加工道次有關(guān)，道次越多，臨界值越低。在相同Z值下，再結(jié)晶晶粒尺寸隨著應(yīng)變的增加而減小。彌散的第二相粒子在動(dòng)態(tài)再結(jié)晶過程中起了重要作用。

    Abstract:

    The 7075 aluminum alloy is forged at different strain in different ways. OM(optical microscope) and TEM(transmission electric microscope) were employed to observe the microstructure of 7075 aluminum alloy after hot deformation. Experiment results indicated that 7075 aluminum can occur dynamic recrystallization under hot forging and fine grain can be obtained at the same time, whose recrystallization mechanism and nucleation mechanism are discontinuous dynamic recrystallization and subgrain rotation and polymerization respectively. Its critical strain value is related to deformation pass, the more passes are, the smaller critical strain value will become. Recrystallized grain size decreases with increase of strain, and dispersed second-phase particles play a very important role during dynamic recrystallization.

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周建 張廷杰 張小明 馬光來 田鋒 周廉.鍛造方式對(duì)7075鋁合金鍛件動(dòng)態(tài)再結(jié)晶的影響[J].稀有金屬材料與工程,2004,33(8):827~830.[Zhou Jian, Zhang Tingjie, Zhang Xiaoming, Ma Guanglai, Tian Feng, Zhou Lian. The Influence of Forge Mode on Dynamic Recrystallization for 7075 Aluminum Alloy during Forging[J]. Rare Metal Materials and Engineering,2004,33(8):827~830.]
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  • 最后修改日期:2003-01-07
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