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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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高温退火对铸态和挤压态Mg97Y2Zn1合金中长周期堆垛有序结构形态的影响
DOI: 10.3724/SP.J.1037.2013.00188, PP. 1255-1263
Keywords: Mg97Y2Zn1合金,长周期堆垛有序结构,高温退火,18R,14H
Abstract:
研究了铸态和挤压态Mg97Y2Zn1合金中长周期堆垛有序结构在高温退火时的组织演化.结果表明,铸态合金由网状的18R-LPSO相、堆垛层错、α-Mg和少量的Mg24Y5颗粒组成.经过挤压后,第二相沿挤压方向呈带状分布,同时在基体内析出大量尺寸细小的14H层片.铸态合金退火初期,14H结构在18R周围的层错区内大量形核,随后18R沿着层错向14H层片转变,14H层片不断增厚和增长,并在退火30h时体积达到最大.此后继续退火时,18R向14H的转变和14H的溶解同时进行,在退火200h的样品基体内部几乎不存在14H层片,只在18R相周围有少量残余14H结构.对于挤压态合金,由于挤压时大量形核位置的引入,14H晶核在合金中已大量存在.退火时,18R结构不断溶解于基体中直至全部消失,14H层片则随退火时间的延长连续增长和增厚.当14H层片覆盖基体后,继续延长退火时间,14H层片的增长受到α-Mg晶界阻碍,只发生粗化以及溶解过程.在退火200h的挤压态样品中,只剩下粗化的14H结构.
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