摘要镁合金是目前最轻的金属结构材料。其具有导电性、导热性、电磁屏蔽性,同时性能良好,比强度和比刚度高,减震性好,切削加工和尺寸稳定性佳,易回收,有利于环保等优点,被誉为“21 世纪的绿色工程材料”。镁合金塑性差是镁基合金加工与应用上的一个通病,改善其塑性也就成为本次课题中急需解决的关键技术之一。本文通过研究在不同异速比、原始厚度和轧辊温度下镁合金室塑性变化的影响。实验后对试样的显微组织和力学性能进行了测试,结果表明:在轧制过程中,适当的异速比可以减少孪晶的数量,提高了镁合金板材的延伸率。不同原始厚度,拉伸性能也有差异。当上辊温度为250℃和下辊温度300℃时,再结晶较充分,且辊温度上升可以消除轧件的加工硬化。21642 毕业论文关键词:轧辊温度;AZ31镁合金;异速比;原始厚度
Abstract
Magnesiumalloyis thelightest metalstructural materials.It has electrical conductivity, thermal conductivity, electromagnetic shielding, while good performance, specific strength and stiffness, damping, good machinability and good dimensional stability, easy recovery, environmental protection, etc., known as "21 century green engineering materials".A common problem on processing and application of magnesium-based alloys is the poor magnesium alloy plasticity.By studyingtheeffects ofmagnesium alloy plasticity changes in different ratio,the original thickness and roll temperatures in room temperature.After the experiment microstructure and mechanical properties of microscopic samples were tested.The resultsshowed that in the rolling process,the appropriate ratio can reduce the number of different twinning and improve the elongation of magnesium alloy sheet.When the original thickness is different,the tensile properties are different.When the top roll temperature is 250 ℃ and the lower roll temperature is 300℃,the recrystallization is more fully,the roller temperature rising can eliminate the hardening.
KeyWords: roll temperature;AZ31 magnesium alloy;iso ratio;original thickness