Examination of the origin of the peculiar anomalous strengthening behavior appeared in some Ni-solid solution alloys

研究了Ni-22 Cr-8 W（at.%）合金的塑性变形行为，Ni-8 W和Ni-5 Re Ni固溶体合金单晶。首次发现Ni-22 Cr-8 W（at.%）合金中存在屈服应力异常（YSA）。以及其中溶质原子形成短程有序（SRO）结构的Ni-8 W单晶。YSA的峰值温度被认为与SRO的热稳定性有关。SRO的控制有可能通过诱导不同于固溶体合金和完全有序合金的变形行为来提高材料的高温强度。

We examined the plastic deformation behavior of Ni-22Cr-8W(at.%), Ni-8W, and Ni-5Re Ni-solid solution alloy single crystals. We first found that yield stress anomaly(YSA) appears in Ni-22Cr-8W(at.%) and Ni-8W single crystals in which the solute atoms form the short-range ordered(SRO) structure. The peak temperature of the YSA is considered to be related to the thermal stability of the SRO. The control of SRO has a potential to improve the high-temperature strength of the materials by inducing the deformation behavior different from those in solid-solution alloys and fully ordered alloys.