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純鎢經(jīng)高壓扭轉(zhuǎn)后韌性及熱穩(wěn)定性觀察
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同濟(jì)大學(xué)材料科學(xué)與工程學(xué)院

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國際熱核聚變實驗堆(ITER)計劃


Observations on the ductility and thermostability of tungsten processed from micropowder by improved high-pressure torsion
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Tongji University

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    摘要:

    采用高壓扭轉(zhuǎn)法，在440℃對純鎢進(jìn)行大塑性變形(HPT)。硬度測試表明試樣表面純鎢經(jīng)高壓扭轉(zhuǎn)后硬度高達(dá)1150HV。差熱分析(DSC)結(jié)果表明等效應(yīng)變較小的試樣再結(jié)晶溫度較高(高于1450℃)，等效應(yīng)變較大的試樣再結(jié)晶溫度較低(約800℃)。XRD分析結(jié)果表明試樣晶格應(yīng)變達(dá)0.35%，晶格常數(shù)達(dá)0.3177 nm，位錯密度達(dá)2.4 × 1015 m-2。高壓扭轉(zhuǎn)可以使純鎢在低溫下實現(xiàn)固結(jié)并具有高強(qiáng)度，一定的韌性和熱穩(wěn)定性。

    Abstract:

    Tungsten was subjected to severe plastic deformation at 440°C using high pressure torsion (HPT) with an improved die-set. Microhardness measurements suggest an appreciable ductility level in tungsten after HPT with Vickers microhardness as high as ~1150 HV. Differential scanning calorimetry (DSC) analyses showed that samples that developed less strain had a higher recrystallisation temperature (greater than 1450°C) than samples that developed more strain (~800°C). X-ray diffraction analyses indicate increases in lattice strain of up to 0.35%, lattice parameter up to 0.3177 nm and dislocation density up to 2.4 × 1015 m-2. The current study introduces the improved HPT process as an effective route for the production of ultrahigh strength W with significant ductility and specified thermostability.

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梁辰.純鎢經(jīng)高壓扭轉(zhuǎn)后韌性及熱穩(wěn)定性觀察[J].稀有金屬材料與工程,2016,45(12):3089~3094.[LiangChen. Observations on the ductility and thermostability of tungsten processed from micropowder by improved high-pressure torsion[J]. Rare Metal Materials and Engineering,2016,45(12):3089~3094.]
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  • 收稿日期:2014-09-07
  • 最后修改日期:2014-11-14
  • 錄用日期:2014-12-25
  • 在線發(fā)布日期: 2017-02-06
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