Uniaxial-stress dependence of the phonon behavior in the premartensitic phase of Ni62.5Al37.5.
Uniaxial-stress dependence of the phonon behavior in the premartensitic phase of Ni62.5Al37.5.
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DOI：
10.1103/physrevb.48.13223
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发表时间：
1993-11
期刊：
影响因子：
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通讯作者：
Shapiro;Svensson;Vettier;Hennion
中科院分区：
文献类型：
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作者：
Shapiro;Svensson;Vettier;Hennion
本文报道了Ni[sub 62.5]Al[sub 37.5]单晶的中子散射实验结果。重点放在低能量部分的[[zeta][zeta]0]-TA[sub 2]声子分支及其相关的中心峰的行为。声子色散曲线中的下降是应力依赖性的，并且在室温下从零应力的[zeta]=0.14移动到施加85 MPa应力的[zeta]=0.18。随着温度的降低，卫星进一步移动，声子能量显著降低，线宽变宽。这些结果解释克拉普的本地化软模式理论的马氏体形核。
Results of neutron-scattering experiments on a single crystal of Ni[sub 62.5]Al[sub 37.5] as a function of uniaxial stress and temperature are reported. Emphasis is placed on the behavior of the low-energy part of the [[zeta][zeta]0]-TA[sub 2] phonon branch and its associated central peak. The dip in the phonon-dispersion curve is stress dependent and shifts from [zeta]=0.14 for zero stress to [zeta]=0.18 for an applied stress of 85 MPa at room temperature. As the temperature decreases the satellite shifts further, the phonon energy decreases considerably, and the linewidths become broad. These results are interpreted in terms of Clapp's localized soft-mode theory of nucleation in martensite.