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Influence of quench transfer time on microstructure and mechanical properties of 7055 aluminum alloy

Journal of Central South University of Technology 2008年第2期15卷 153-158页

作者：游江海刘胜胆张新明张小艳 Educational Key Laboratory of Non-ferrous Metal Materials Science and Engineering Central South University

The influence of quench transfer time on the microstructure and mechanical properties of 7055 aluminum alloy with and without zirconium was investigated by tensile properties test,optical microscopy,scanning electron microscopy and transmission electron *** the Zr-free alloy,the strength increases to the highest value at 20 s with transfer time,and then decreases *** elongation decreases slowly with transfer time within 20 s,and more rapidly after 20 *** the Zr-containing alloy,prolonging transfer time within 20 s results in slight decrease in the strength and elongation,and rapid drop of which is observed after 20 *** the Zr-free alloy,prolonging transfer time can increase the percentage of intergranular fracture,which is mainly caused by wide grain boundary precipitate free *** failure mode of the Zr-containing alloy is modified from the predominant transgranular void growth and intergranular fracture to transgranular shear and intergranular fracture with increase in the transfer time,which is attributed to the wider grain boundary precipitate free zone and coarse equilibrium η phases in the matrix.

关键词： 7055 aluminum alloy transfer time mechanical properties grain boundary precipitate free zone intergranular fracture

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Problem Specific Genetic Differential Evolution Algorithm for Multi-skill Resource-constrained Project Scheduling of Collaborative Multi-Robot Systems for Search and Rescue

Problem Specific Genetic Differential Evolution Algorithm fo...

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第40届中国控制会议

作者： Jingbo Sun Zhihong Peng Junqi Cai School of Automation Beijing Institute of Technology

Multi-Robot system can be applied to search and rescue（SAR） tasks in complex environment. This paper focuses on resource scheduling and task allocation of cooperative multi-robot system for SAR（RSTA-RSSAR）. RSTA-RSSAR is an extention of MSRCPSP. In RSTA-RSSAR, skills of multi-robot system considered from both depth and breadth. And resouece transfer time between tasks are considered. Meanwhile, Processing time of activities in RSTA-RSSAR changes with skill ability resouces provided. In order to solve the problem effectively, a genetic differential evolution algorithm（PS-GDEA） is *** encoding, decoding and population initialization methods is designed according to the characteristics of RSTA-RSSAR. In this algorithm, a multi-attribute choosing method based on Shannon entropy is proposed. Meanwhile, a genetic algorithm with new selection, crossover and mutation operators is used to generate offspring and a priority based differential evolution strategy is used to evolute *** effectiveness of the algorithm is obtained by experiments on test cases. Compared with the classical genetic algorithm for msrcpsp, the proposed algorithm has better performance.

关键词： Problem specific GDEA RCPSP RSTA-RSSAR Multi-skilled resources transfer time

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