论文部分内容阅读
以相变晶体学为主要原则对Mg-Sn-X合金进行优化设计.在对现有镁合金系统充分调研的基础上,根据Mg基体与析出相的相变晶体学匹配关系,提出2条相变晶体学判据来判断可能沿Mg基体[0001]_α方向择优生长的析出相.根据这2条相变晶体学判据结合相图分析推测在Mg-Sn-Mn系统中可能得到沿Mg基体[0001]_α方向择优生长的β-Mn析出相.对Mg-7.5Sn-2.2Mn(质量分数,%)合金时效组织的TEM研究证实了上述判断.研究结果表明,β-Mn析出相呈棒状,长轴沿Mg基体[000i]_α方向,它与Mg基体的位向关系(OR)是:[0001]_α∥[211]_(β-Mn),[0110]_α∥[011]_(β-Mn),[2110]_α∥[111]_(β-Mn).
Based on phase transformation crystallography, the optimal design of Mg-Sn-X alloy was studied.On the basis of full investigation of the existing magnesium alloy system, according to the phase transition crystallographic matching relationship between Mg matrix and precipitated phase, two phases According to these two phase transition crystallographic criteria combined with the phase diagram analysis, it is presumed that in the Mg-Sn-Mn system, it is possible to obtain the precipitates along the Mg matrix The [0001] preferentially grown β-Mn precipitates in the α-direction were confirmed by TEM studies on the aged microstructure of Mg-7.5Sn-2.2Mn (mass fraction) alloy.The results show that the β-Mn precipitates are rod- , The major axis along the Mg matrix [000i] _α direction, and its orientation with the Mg matrix (OR) is: [0001] _α∥ [211] _ (β-Mn), [010] _α∥ [011] _ β-Mn), [2110] _α∥ [111] _ (β-Mn).