CAJ | 학술논문

运用结合双温模型的分子动力学方法，数值模拟了脉宽为100 fs的超短脉冲激光烧蚀B2结构镍钛形状记忆合金薄膜的作用，研究了较低能量密度下B2结构镍钛形状记忆合金靶材的相变过程。结果表明，超快激光与B2结构镍钛形状记忆合金相互作用时，压力波传播引起了热能的弛豫。脉宽为100 fs，功率密度为20~35 mJ/cm2的激光与靶材作用时，烧蚀产生的压力波在其传播过程中诱导靶材发生了相变，并形成三明治结构。
운용결합쌍온모형적분자동역학방법，수치모의료맥관위100 fs적초단맥충격광소식B2결구얼태형상기억합금박막적작용，연구료교저능량밀도하B2결구얼태형상기억합금파재적상변과정。결과표명，초쾌격광여B2결구얼태형상기억합금상호작용시，압력파전파인기료열능적이예。맥관위100 fs，공솔밀도위20~35 mJ/cm2적격광여파재작용시，소식산생적압력파재기전파과정중유도파재발생료상변，병형성삼명치결구。
Incorporating with molecular dynamics method of two-temperature model, the effect of B2 structure Ni-Ti shape memory alloy film ablated by femto-second laser with 100 fs ultra-short pulse width is simulated in num-ber and the phase transition of the target with lower energy density is researched. The results show that thermal ener-gy relaxation is caused by the propagation of pressure wave when ultra-high speed laser interacts with B2 structure Ni-Ti shape memory alloy. The laser with 100 fs pulse width and 20~35 mJ/cm2 power density interacting with the target, the phase change of the target is induced by the pressure wave from ablating process during propagation. And a sandwich structure is formed.