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				| 1. | Strain hardening due to ___________ process arises from short range force occurring over a distance of 5 to 10 atomic distance. This hardening can be overcome at finite temperatures with the help of thermal fluctuations, and therefore, it is temperature and strain-rate-dependent. | 
| A. | dislocation cutting | 
| B. | dislocation pile-up | 
| C. | second phase particle | 
| D. | alloying | 
| Answer» B. dislocation pile-up | |