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升溫速率對(duì)Micro-FAST制備N(xiāo)iTi合金的影響
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四川大學(xué),四川大學(xué),四川大學(xué),四川大學(xué)

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TF124

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51275322


Effect of heating rate on the preparation of NiTi alloy during Micro-FAST
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Sichuan University,Sichuan University,Sichuan University,Sichuan University

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    摘要:

    本文采用多物理場(chǎng)活化燒結(jié)微成形技術(shù)（Micro-FAST），低溫（850℃）、短時(shí)間內(nèi)（約8分鐘）成功制備了尺寸為Φ4?mm的NiTi微型圓柱，并研究了升溫速率對(duì)制備N(xiāo)iTi合金的影響。研究結(jié)果表明，試樣在快速升溫階段發(fā)生最大的收縮量，直接影響了試樣的燒結(jié)質(zhì)量。在實(shí)驗(yàn)范圍25℃/s到125℃/s內(nèi)，隨著升溫速率的提高，NiTi合金的相對(duì)密度降低。升溫速率越大，電流越大。大電流促進(jìn)原子擴(kuò)散，形成富Ni區(qū)，利于NiTi2和Ni3Ti相的形成，并加劇Kirkendall效應(yīng)，生成更多孔隙；試樣在電流作用下產(chǎn)生局部高溫，促使局部液相生成，融化周?chē)勰┥煽紫丁?/p>

    Abstract:

    In this paper, a novel method Micro-fields activated sintering technology was applied to the preparation of NiTi alloy. Cylindrical specimens with the diameter of 4mm and a height of 4mm were prepared successfully in a short time (about 8mins). The effect of heating rate on the preparation of NiTi alloy was discussed. The research result shows that the axial reduction in rapid heating stage was the biggest among the four sintering stages of Micro-FAST, which directly influenced the quality of sintering samples. In the experimental range of 25℃/s to 125℃/s, the relative densities of NiTi alloy sintered by Micro-FAST was decreased with the increasing heating rates. The higher the heating rate, the bigger the electric current is. Under electric current, atomic diffusion was promoted. As a result, NiTi2 and Ni3Ti were easier to be formed, and the effect of Kirkendall was aggravated. Meanwhile, local liquid-phase was produced by local high temperature under electric current, which promoted the fusions of particles and pores.

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趙旦,楊屹,楊剛,尹德強(qiáng).升溫速率對(duì)Micro-FAST制備N(xiāo)iTi合金的影響[J].稀有金屬材料與工程,2016,45(7):1816~1820.[Zhao Dan, Yang Yi, Yang Gang, Yin Deqiang. Effect of heating rate on the preparation of NiTi alloy during Micro-FAST[J]. Rare Metal Materials and Engineering,2016,45(7):1816~1820.]
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  • 收稿日期:2014-06-23
  • 最后修改日期:2014-09-18
  • 錄用日期:2014-10-30
  • 在線發(fā)布日期: 2016-10-09
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