Effect of solute atom concentration on vacancy cluster formation in neutron-irradiated Ni alloys
Effect of solute atom concentration on vacancy cluster formation in neutron-irradiated Ni alloys
复制标题
中子辐照镍合金中溶质原子浓度对空位簇形成的影响
DOI：
10.1016/j.jnucmat.2010.12.184
复制
发表时间：
2011
影响因子：
3.1
通讯作者：
T.Toyama
中科院分区：
文献类型：
--
作者：
K.Sato;D.Itoh;T.Yoshiie;Q.Xu;A. Taniguchi;T.Toyama
采用正电子湮没寿命法研究了镍合金中溶质原子浓度对组织演化的影响。纯Ni中正电子湮灭寿命，Ni - 0.05at。%如果,倪−0.05。%Sn、Ni−Cu和Ni−Ge合金即使在3×10−4dpa的低辐照剂量下也能达到400ps左右，表明这些合金中存在微空洞。当辐照剂量小于0.1dpa时，随着溶质原子浓度的增加，Ni - Si和Ni - Sn合金中的空位团簇尺寸减小；当辐照剂量约为0.1dpa时，空位团簇开始生长。倪−2。用正电子湮灭符合多普勒展宽测量方法检测了%Si辐照引起的偏析。这种偏析抑制了间隙团簇的一维运动，促进了点缺陷的相互湮灭。一维运动的频率和平均自由程与溶质原子浓度和偏析量有关。
The dependence of microstructural evolution on solute atom concentration in Ni alloys was investigated by positron annihilation lifetime measurements. The positron annihilation lifetimes in pure Ni, Ni−0.05at.%Si, Ni−0.05at.%Sn, Ni−Cu, and Ni−Ge alloys were about 400ps even at a low irradiation dose of 3×10−4dpa, indicating the presence of microvoids in these alloys. The size of vacancy clusters in Ni−Si and Ni−Sn alloys decreased with an increase in the solute atom concentration at irradiation doses less than 0.1dpa; vacancy clusters started to grow at an irradiation dose of about 0.1dpa. In Ni−2at.%Si, irradiation-induced segregation was detected by positron annihilation coincidence Doppler broadening measurements. This segregation suppressed one-dimensional (1-D) motion of the interstitial clusters and promoted mutual annihilation of point defects. The frequency and mean free path of the 1-D motion depended on the solute atom concentration and the amount of segregation.