Abstract Mechanoluminescence (ML) from deformed ductile materials is caused by sliding of charged dislocations. The main source of the ML in loaded brittle solids is the interatomic bond breakage. In this work, the ML from impact damaged ductile ZnS ceramics was studied. It was revealed that the time series of ML pulses exhibited two well-separated peaks. A two-stage ML excitation of this kind in ZnS ceramics was observed when the applied load exceeded an ultimate plastic deformation. The positions of each peak along the time axis were found to be dependent in different ways on physical and mechanical properties of crystallites that constituted the given ceramics. The investigated ceramics were produced by four different technological methods. The obtained samples differing in the dimensions of grains and separation of grain boundaries were tested. The statistical analysis of a temporal pattern of the ML lighting showed that the mechanisms of excitation of the two peaks were not the same. The first ML peak was assigned to the plastic deformation preceding the ceramics cracking. The second peak originated from the interatomic bond breakage in nucleated and growing cracks.

中文翻译：

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来自冲击负载的硫化锌陶瓷的机械发光的时间模式

摘要 变形延性材料的机械发光 (ML) 是由带电位错的滑动引起的。负载脆性固体中 ML 的主要来源是原子间键断裂。在这项工作中，研究了冲击损坏的延展性 ZnS 陶瓷的 ML。结果表明，ML 脉冲的时间序列表现出两个分离良好的峰。当施加的载荷超过极限塑性变形时，在 ZnS 陶瓷中观察到这种类型的两阶段 ML 激发。发现每个峰沿时间轴的位置以不同方式依赖于构成给定陶瓷的微晶的物理和机械性能。所研究的陶瓷是通过四种不同的技术方法生产的。测试获得的在晶粒尺寸和晶界分离方面不同的样品。ML 照明时间模式的统计分析表明，两个峰值的激发机制不同。第一个 ML 峰归因于陶瓷开裂之前的塑性变形。第二个峰源于成核和不断增长的裂纹中的原子间键断裂。