-1條件下真應(yīng)變達(dá)0.69的熱變形行為,基于改進(jìn)動(dòng)態(tài)材料模型(MDMM)和Malas’s準(zhǔn)則建立功率耗散圖和熱加工圖,結(jié)合微觀組織確定出合理熱加工參數(shù),并對(duì)材料的損傷方式進(jìn)行分析。結(jié)果表明：W80-Cu20復(fù)合材料的應(yīng)力-應(yīng)變曲線表現(xiàn)出典型的動(dòng)態(tài)再結(jié)晶型特征,峰值應(yīng)力隨變形溫度的降低和應(yīng)變速率的增加而增加；確定出W80-Cu20復(fù)合材料的合理熱加工區(qū)域?yàn)椋?40~885℃、0.2~1.42 s-1和885~917℃、0.83~2.05 s-1；W80-Cu20復(fù)合材料的損傷方式主要有Cu相撕裂、W-Cu界面分離、W-W界面分離以及W顆粒破碎。"/>

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W80-Cu20復(fù)合材料熱變形行為及加工圖研究
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西安建筑科技大學(xué)冶金工程學(xué)院

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國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)51874226、52034005),陜西省重點(diǎn)研發(fā)計(jì)劃資助(2020ZDLGY12-09)


Thermal deformation behavior and processing map of W80-Cu20 composite by hot compressing
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College of Metallurgy Engineering,Xi’an University of Architecture and Technology,Xi’an

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    摘要:

    采用Gleeble-1500熱模擬機(jī)研究了W80-Cu20(wt.％)復(fù)合材料在變形溫度為810~970 ℃和應(yīng)變速率為0.01~10 s-1條件下真應(yīng)變達(dá)0.69的熱變形行為,基于改進(jìn)動(dòng)態(tài)材料模型(MDMM)和Malas’s準(zhǔn)則建立功率耗散圖和熱加工圖,結(jié)合微觀組織確定出合理熱加工參數(shù),并對(duì)材料的損傷方式進(jìn)行分析。結(jié)果表明：W80-Cu20復(fù)合材料的應(yīng)力-應(yīng)變曲線表現(xiàn)出典型的動(dòng)態(tài)再結(jié)晶型特征,峰值應(yīng)力隨變形溫度的降低和應(yīng)變速率的增加而增加；確定出W80-Cu20復(fù)合材料的合理熱加工區(qū)域?yàn)椋?40~885℃、0.2~1.42 s-1和885~917℃、0.83~2.05 s-1；W80-Cu20復(fù)合材料的損傷方式主要有Cu相撕裂、W-Cu界面分離、W-W界面分離以及W顆粒破碎。

    Abstract:

    The thermal deformation behavior of W80-Cu20 composites was investigated by hot compression with Gleeble-1500 thermal simulation system in the temperature range of 810-970℃ and strain rate range of 0.01~ 10s-1 up to a true strain of 0.69. Based on modi?ed dynamic materials model (MDMM) and Malas"s criterion, the power dissipation map and processing map were established. Combined with microstructure, the reasonable parameters of hot processing were determined. And the damage formation of W80-Cu20 composite was analyzed. The results show that the stress-strain curves of W80-Cu20 composite are typical dynamic recrystallization (DRX) type curves, and the peak stress increases with the decreasing of deformation temperature and the increasing of strain rate. The preferable processing zones of W80-Cu20 composite were determined as follows: 840-885 ℃, 0.2-1.42 s-1 and 885-917℃, 0.83-2.05 s-1. The damage modes of W80-Cu20 composites involve Cu phase rupture, W-Cu interfacial separation, W-W grain boundary separation and W-grain crack.

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張兵,劉鵬茹,張志娟,趙田麗,趙芬芬,馬艷恒. W80-Cu20復(fù)合材料熱變形行為及加工圖研究[J].稀有金屬材料與工程,2022,51(1):203~210.[Zhang Bing, Liu Pengru, Zhang Zhijuan, Zhao Tianli, Zhao Fenfen, Ma Yanheng. Thermal deformation behavior and processing map of W80-Cu20 composite by hot compressing[J]. Rare Metal Materials and Engineering,2022,51(1):203~210.]
DOI：10.12442/j. issn.1002-185X.20210032

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  • 收稿日期:2021-01-12
  • 最后修改日期:2021-02-01
  • 錄用日期:2021-03-17
  • 在線發(fā)布日期: 2022-02-09
  • 出版日期: 2022-01-28