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镁-钍-锰合金在350℃,3.0公斤/毫米~2的条件下蠕变时,经过冷加工和不经过冷加工的试样具有不同形状的蠕变由线。未经冷加工的试样在恒速蠕变阶段几乎看不到的情况下即进入加速蠕变阶段,而经过冷加工的试样的恒速蠕变阶段则很长。未经过冷加工的试样在蠕变第一阶段出现明显的滑移,进入蠕变第三阶段出现多边化及显著的晶界滑动,这两个过程同时进行并相互影响可能是使恒速蠕变阶段不明显的基本原因。冷加工强化了晶体,减缓了晶界滑动的速率,从而使蠕变第二阶段显著增长。合金在上述条件下沿晶界断裂主要是服从Zener的应力集中机构。
Magnesium-thorium-manganese alloy creep at 350 ° C, 3.0 kg / mm 2, and samples that have been cold worked and not cold worked have different shapes of creep by wire. Cold-worked specimens entered the accelerating creep stage with almost no visible change at constant creep, while the specimens subjected to cold working experienced constant creep. In the first stage of creep, there is obvious slip in the specimen without cold working, and the multilateral and significant grain boundary sliding occurs in the third stage of creep into creep. The two processes simultaneously and interact with each other may cause constant creep Stage is not obvious the basic reason. Cold working strengthens the crystals and slows the rate of grain boundary sliding, resulting in a significant increase in the second phase of creep. Alloy under the above conditions along the grain boundary fracture is mainly subject to Zener stress concentration mechanism.