The damping effect from dislocation twin crystal or other crystal defects also reduces ultrasonic speed .

位错、 孪晶等晶体缺陷的阻尼效应也降低了声波的传播速度。

Optimization of Technique for Preparing Nanoscale Twin Crystal Nickel Coating by Orthogonal Test

纳米 孪晶镍镀层制备工艺的正交设计优化