Plasticity increased 40% compared with conventional heat treatment, and achieved the highest value.
塑性在双重热处理时达到最高值，比常规热处理提高了40%左右。
2
However, large grain size and continuous grain boundaries combine to produce stress concentrations, thus lowering the plasticity and impact value of alloy after solution and aging treatment.
而粗大的晶粒及连续的晶界容易产生应力集中，因此合金经固溶时效后具有较低的塑性和冲击值。
3
This indicates the formulas are feasible, and approximate plasticity conditions have the distinct effect on the value of extrusion force given by calculating formulas.