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[0001]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.
Crystallography of phase transformation is used as the main principal to guide Mg-Sn-X alloy design. Based on a comprehensive literature survey, two criteria of crystallography of phase transformation are given to select the precipitate probably growing along [0001]α direction of Mg matrix. Combined with available data of phase diagram, we deduce that β-Mn in Mg-Sn-Mn system is a hopeful candidate. TEM study on the specimen of Mg-7.5Sn-2.2Mn (mass fraction, %) alloy confirms that rod-like β-Mn precipitates grow along [0001]α, and their orientation relationship (OR) with Mg matrix is [0001]α///[211]β-Mn, [0110]α///[011]β-Mn, [2110]α//[111]β-Mn.
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