Precipitation Processes in Mg–Th, Mg–Th–Mn, Mg–Mn, and Mg–Zr Alloys
Precipitation Processes in Mg–Th, Mg–Th–Mn, Mg–Mn, and Mg–Zr Alloys
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DOI：
10.1179/030634572790446127
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发表时间：
1972-01
期刊：
影响因子：
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通讯作者：
D. J. Stratford;L. Beckley
中科院分区：
文献类型：
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作者：
D. J. Stratford;L. Beckley
用电子显微镜研究了部分镁基合金的析出过程。主要研究了镁-钍合金中锰的析出作用。结果表明，在Mg-2.0%Th-1.0%Mn合金(HM21)中的析出顺序不像在Mg-3.0%Th-0.5Zr合金(HK31)中那样复杂，因为只有一个共格转变相先于非共格析出物的形成。共格析出物在{0 0 0 1}Mg上呈圆盘状，具有六方晶体结构a=5.5 6ä(√3×a mg)和c=31.6ä(6×a mg)，取向关系为：{0 0 0 1}ppte‖{0 0 0 1}mg{11 2‘0}ppte‖{10 1’0}mg，在继续时效过程中转变为平行于<112 0>mg的雪茄状平衡析出相。此外，为了更好地了解Mg-Th-Mn和Mg-Th-Zr两个三元系的金相学，还对三种二元合金Mg-Th、Mg-Mn和Mg-Zr进行了研究。
A study has been made of precipitation processes in selected magnesium-base alloys by means of electron microscopy. The principal part of the investigation was concerned with the effect of manganese precipitation in a Mg-Th alloy. It is shown that the sequence of precipitation in a Mg–2.0percnt; Th–1.0% Mn alloy (HM21) is not as complex as that occurring in a Mg–3.0% Th–0.5 Zr alloy (HK31), in that only one coherent transition precipitate precedes the formation of an incoherent precipitate. The coherent precipitate forms as discs on the {0001}Mg and has an hexagonal crystal structure a = 5.56Å (√3 × a Mg) and c =31.6Å (6 × a Mg) and the orientation relationship is { 0001 } ppte ‖ { 0001 } Mg { 11 2 ¯ 0 } ppte ‖ { 10 1 ¯ 0 } Mg This transforms on continued ageing to a cigarshaped equilibrium precipitate parallel to 〈1120〉Mg. Additionally, the three binary alloys Mg–Th, Mg–Mn, and Mg–Zr were studied in order to obtain a better understanding of the metallography of the two ternary systems Mg–Th–Mn and Mg–Th-Zr.