The effect of prior plastic deformation on the discontinuous precipitation in a supersaturated binary Ni-Cr alloy (42 wt pct Cr) was investigated. Solutionised samples were cold rolled to different extents of reduction (20, 50 and 70 pct) and then subjected to aging heat treatments in the temperature range of 923 K to 1123 K (650 °C to 850 °C) for different time periods, resulting in the precipitation of α-Cr in various morphologies. The α-Cr precipitates were in the form of lamellar discontinuous precipitation, acicular continuous precipitation along the deformation bands, globularization and equiaxed precipitation concurrently with matrix recrystallization. The volume fraction of each morphology varied according to the heat treatments. Overall, the prior plastic deformation had a retarding effect on the kinetics of discontinuous precipitation and accelerated the kinetics of continuous precipitation. The retardation of discontinuous precipitation was attributed to the loss of supersaturation of the matrix due to the other competing modes of precipitation supported by deformation. Plastic deformation prior to aging is shown to be a possible route for engineering the microstructure in this alloy.

研究了先验塑性变形对过饱和二元Ni-Cr合金（42 wt pct Cr）中不连续析出的影响。将固溶的样品冷轧至不同程度的压下率（20、50和70 pct），然后在923 K至1123 K（650°C至850°C）的温度范围内进行不同时间的时效热处理，从而得到在各种形态的α- Cr析出中 该α-Cr沉淀为层状不连续沉淀，沿变形带的针状连续沉淀，球化和等轴沉淀以及基质重结晶。每种形态的体积分数根据热处理而变化。总体而言，先前的塑性变形对不连续沉淀的动力学具有阻滞作用，并加速了连续沉淀的动力学。不连续降水的延迟归因于由于变形支持的降水的其他竞争模式，基质的过饱和度的损失。时效之前的塑性变形被证明是对该合金的显微组织进行工程设计的一种可能途径。