研究了LC9铝合金经退火、淬火,及不同条件时效处理后的锯齿流变行为开始出现锯齿的临界应变ε_c随着时效加深而后移,从而测得过程的激活能为0.63eV,与空位在Al中的扩散激活能吻合。时效试样与退火试样不同,应变率ε增大,ε_c反而减小;而退火试样的ε_c则随ε而增大。说明退火试样的锯齿流变是形变空位控制的,而时效试样则是淬火空位控制的。若时效时间加长,锯齿由较为整齐的脱钉型变为明显衰减的钉扎型。锯齿密度也因时效而稍许减小。用位错与溶质原子及GP区的作用对以上现象进行了解释。
The serrated flow of LC9 Al alloy with different regimes of heat treatment has been investigated at constant rate of stretching. The critical strain ε_?.at the starting of serrated flow increases with the degree of aging. From those ε_?,the activation energy of the process is 0.63 eV which is consistant with the diffusion activation energy of vacancies in Al. The ε_? decreases while the strain rate ε increases, i. e., with negative strain rate relation. This relation is contrary to that of the annealed samples. It shows that the serrated flow of annealed sample is controlled by deformation vacancies, and that of aged sample is controlled by quenching vacancies. The density and shape of the serrations are changed by aging. The mechanism of the above mentioned results is discussed.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] |
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