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W-75%Cu復(fù)合材料的高溫變形行為及加工圖
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國家自然科學(xué)基金 (50571035)


Hot Deformation Behavior and Processing Maps of W-75%Cu Composite
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    摘要:

    利用Gleeble-1500D熱模擬試驗機，在溫度650~950 ℃、應(yīng)變速率0.01~5 s-1、總應(yīng)變量0.7的條件下，對W-75%Cu復(fù)合材料高溫塑性變形行為及其熱加工圖進行研究和分析。結(jié)果表明：W-75%Cu復(fù)合材料高溫流動應(yīng)力-應(yīng)變曲線主要以動態(tài)再結(jié)晶為特征，峰值應(yīng)力隨變形溫度的降低或應(yīng)變速率的升高而增加；在真應(yīng)力-應(yīng)變曲線基礎(chǔ)上，建立的W-75%Cu復(fù)合材料高溫變形本構(gòu)模型較好地表征了其高溫流變特性；同時，利用W-75%Cu復(fù)合材料DMM加工圖分析其變形機制和失穩(wěn)機制，可確定其熱加工工藝參數(shù)應(yīng)優(yōu)先選擇變形溫度800~950 ℃、應(yīng)變速率0.01~0.1 s-1

    Abstract:

    Using the Gleeble-1500D simulator, the high-temperature plastic deformation behavior and processing map of W-75%Cu composite were investigated at 650~950 ℃ with the strain rate of 0.01~5 s-1 and total strain of 0.7. The results show that the softening mechanism of dynamic recrystallization is a feature of high-temperature flow stress-strain curves of W-75%Cu composite, and the peak stress increases with the decrease of deformation temperature or the increase of strain rate. Based on the true stress-strain curves, the established constitutive equation represents the high-temperature flow behavior of W-75%Cu composite, and the calculated results of the flow stress are in good agreement with the experimental results of the high-temperature deformation of W-75%Cu composite. Meanwhile, the obtained processing map of Dynamic Material Modeling is used to analyze the deformation mechanism and the destabilization mechanism of W-75%Cu composite, the optimal deformation processing parameters of the deformation temperatures range and the strain rates range are 800~950 ℃ and 0.01~0.1 s-1, respectively

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劉 勇,趙瑞龍,田保紅,張曉偉,張 毅. W-75%Cu復(fù)合材料的高溫變形行為及加工圖[J].稀有金屬材料與工程,2012,41(8):1357~1361.[Liu Yong, Zhao Ruilong, Tian Baohong, Zhang Xiaowei, Zhang Yi. Hot Deformation Behavior and Processing Maps of W-75%Cu Composite[J]. Rare Metal Materials and Engineering,2012,41(8):1357~1361.]
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  • 收稿日期:2011-09-03
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