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采用常温冲击实验和拉伸实验研究了大断面7050铝合金型材横向3个典型位置的力学性能的差异,并通过OM,EBSD和TEM分析了其显微组织.结果表明:晶粒尺寸约为12μm的型材芯部比晶粒尺寸约为6μm的边部的屈服强度高,其原因是芯部较硬Copper取向的形变织构组分更强.根据固溶合金元素含量所得的固溶强化项、亚晶粒尺寸所得的晶界强化项和合金的屈服强度可计算Taylor因子,芯部为3.925,边部为2.257.晶界强化模型中Hall-Petch模型比Nes模型更适用于计算固溶后的晶界强化对合金屈服强度的贡献.此外,还建立了3种试样过时效态冲击功与亚晶粒尺寸之间的线性关系.
The mechanical properties of 7050 aluminum alloy profiles with large cross section were studied by using the impact test and tensile test at room temperature. The OM, EBSD and TEM were used to analyze the microstructures. The results show that the grain size is about 12μm Of the core of the profile has a higher yield strength than that of the edge with a grain size of about 6 μm due to a stronger textured orientation of the core in the harder Copper orientation.According to the solid solution strengthening element obtained from the content of the alloying element, The Taylor factor was calculated for the yield strength of the grain boundary strengthening and the alloy obtained from the subgrain size, with a core of 3.925 and an edge of 2.257. The Hall-Petch model in the grain boundary hardening model is more suitable than the Nes model The grain boundary strengthens the contribution to the yield strength of the alloy.In addition, the linear relationship between the impact energy and the subgrain size of the three kinds of samples has also been established.