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爆炸焊接記憶合金Ni50Ti50與Cu界面擴(kuò)散機理的研究
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中國礦業(yè)大學(xué),中國礦業(yè)大學(xué),中國礦業(yè)大學(xué)

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國家自然科學(xué)基金資助（項目號11502282,51734009），中央高校基本科研業(yè)務(wù)費專項資金資助（No.2015XKZD02）


Research on the Mechanism of Explosive Welding Interface Diffusion Between Memory Alloy Ni50Ti50 and Cu
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    摘要:

    為了揭示焊接界面細(xì)觀尺度擴(kuò)散特征，采用內(nèi)嵌入勢函數(shù)（EAM勢）通過對形狀記憶合金Ni50Ti50和Cu進(jìn)行爆炸焊接界面分子動力學(xué)數(shù)值模擬，同時結(jié)合SEM、EDX測試方法對爆炸焊接界面微細(xì)觀形貌及物理特征實驗分析，研究結(jié)果表明以記憶合金Ni50Ti50與Cu在采用uz= -1500 m/s, ux= 700 m/s沖擊碰撞工況下，體系的壓強震蕩逐漸變小，120ps以后已經(jīng)趨于平衡，體系的溫度穩(wěn)定在1350K左右，而壓強穩(wěn)定在28GPa左右; 在擴(kuò)散層兩側(cè)Cu的原子濃度一直維持在5%左右，Ni和Ti的原子濃度在47%上下波動，界面擴(kuò)散層厚度在1.03μm~1.45μm的范圍內(nèi)；實驗結(jié)果采用SEM、EDS微觀分析驗證了獲得焊接界面擴(kuò)散層厚度約為1.56μm，基本與計算結(jié)果相一致。

    Abstract:

    This paper mainly adopted a hybrid molecular dynamics simulation method with the classical diffusion theory, in order to reveal the micro-scale diffusion characteristics of the welding interface, the molecular dynamics simulation of the explosive welding interface of shape memory alloy Ni50Ti50 and Cu was carried out by means of the embedded potential function (EAM potential). The micro-morphology and physical characteristics of the explosive welding interface were analyzed by means of SEM and EDX. The pressure oscillation of Ni50Ti50-Cu alloy system becomes smaller and smaller under the impact condition of uz=1500 m/s and ux=700 m/s. The temperature of the system is about 1350 K and the pressure is about 28GPa after 120ps. The atomic concentration of Cu on both sides of the diffusion layer is about 5% and that of Ni and Ti is about 5%. The interfacial diffusion layer thickness ranged from 1.03 to 1.45um. The thickness of the interfacial diffusion layer was about 1.56um, which was verified to the results of the SEM and EDS.

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羅寧,申濤,向俊庠.爆炸焊接記憶合金Ni50Ti50與Cu界面擴(kuò)散機理的研究[J].稀有金屬材料與工程,2018,47(10):3238~3242.[luo ning, SHEN tao, Xiang JUNXIANG. Research on the Mechanism of Explosive Welding Interface Diffusion Between Memory Alloy Ni50Ti50 and Cu[J]. Rare Metal Materials and Engineering,2018,47(10):3238~3242.]
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  • 收稿日期:2017-01-17
  • 最后修改日期:2018-08-29
  • 錄用日期:2017-08-16
  • 在線發(fā)布日期: 2018-11-08
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