Prediction model of lifetime for copper pillar bumps under coupling effects of current and thermal cycling

Ma, Hui-Cai; Guo, Jingdong; Chen, Jianqiang; Wu, Di; Liu, Zhi-Quan; Zhu, Qing–Ling; Shang, Jianku; Zhang, Li; Guo, Hongyan

doi:10.1007/s10854-015-3871-9

Cited by 5 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…can have an effect on the l c , which may promote dislocations from local pinning and thus affect the plastic behavior of materials [130]. Ma et al [131] deduced the creep model under the coupled action of force, electricity and heat:…”

Section: Electroplastic Effectmentioning

confidence: 99%

Mechanism of Electropulsing Treatment Technology for Flow Stress of Metal Material: A Review

Lu,

Tang,

et al. 2024

Alloys

View full text Add to dashboard Cite

Residual stress is caused by non–uniform deformation caused by non–uniform force, heat and composition, which is of great significance in engineering applications. It is assumed that the residual stress is always the upper limit of the elastic limit, so the reduction of the flow stress will reduce the residual elastic stress. It is particularly important to control the flow stress in metal materials. Compared with traditional methods, the use of electropulsing treatment (EPT) technology stands out due to its energy–efficient, highly effective, straightforward and pollution–free characteristics. However, there are different opinions about the mechanism of reducing flow stress through EPT due to the conflation of the effects from pulsed currents. Herein, a clear correlation is identified between induced stress levels and the application of pulsed electrical current. It was found that the decrease in flow stress is positively correlated with the current density and the duration of electrical contact and current action time. We first systematically and comprehensively summarize the influence mechanisms of EPT on dislocations, phase, textures and recrystallization. An analysis of Joule heating, electron wind effect, and thermal–induced stress within metal frameworks under the influence of pulsed currents was conducted. And the distribution of electric, thermal and stress fields under EPT are discussed in detail based on a finite element simulation (FES). Finally, some new insights into the issues and challenges of flow stress drops caused by EPT are proposed, which is critically important for advancing related mechanism research and the revision of theories and models.

show abstract

Section: Electroplastic Effectmentioning

confidence: 99%