MEASUREMENT OF THE INTERACTION BETWEEN A DISLOCATION AND A SOLUTE ATOM BY AMPLITUDE-DEPENDENT INTERNAL FRICTION FOR ALLOY STRENGTHENING.

利用低温振幅相关内耗（ADIF）研究了面心立方金属中位错与溶质原子的相互作用。主要目的是为合金强化提供基础资料。成功地测量了稀铝合金的相互作用势和相互作用能。Zn，Ag，Mg，Cu溶质原子的能量分别为0.11，0.135，0.19，0.195eV。测量被扩展到更低的温度，即0.1 K，以找到通过钉扎原子的位错的量子隧穿的证据。结果发现了位错隧道效应，并提供了理论依据。测量还扩展到更高的温度，低于室温。我们发现位错脱离时，同时与多个钉扎原子相互作用。这种同时的分离被认为是固溶体生成的基本过程。并将铜晶体中ADIF的一个新结果与铝晶体中ADIF的结果进行了比较。

We have investigated the interaction between a dislocation and a solute atom in FCC metals by a low-temperature amplitude-dependent internal friction (ADIF). The main purpose is to provide basic information for alloy strengthening. The interaction potential and interaction energies are sucessfully measured for aluminum dilute alloys. The energies are 0.11, 0.135, 0.19, 0.195 in eV for Zn, Ag, Mg, Cu aolute atoms, respectively. The measurement was extended to further low temperature i.e. 0.1 K to find the evidence of quantum tunneling of a dislocation through a pinning atom. As a result dislocation tunneling is found and a theoretical basis is provided. The measurement was also extended to higher temperature, below room temperature. We found that a dislocation interacts with several pinning atoms simultaneously when it breaks away. This simultaneous breakaway is considered the elementary process of the yield of solid solutions. A new result of ADIF in copper crystals was compared with that for aluminum.