| 添加Nb对LI2型Al3Ti—8Mn基合金的相组成影响 |
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| 引用本文： | 石荣 翁小军. 添加Nb对LI2型Al3Ti—8Mn基合金的相组成影响[J]. 稀有金属材料与工程, 1999, 28(6): 375-379 |
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| 作者姓名： | 石荣 翁小军 |
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| 作者单位： | 上海交通大学,上海,200030 |
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| 基金项目： | 国家自然科学基金!59771005，中国博士后基金，上海市博士后基金 |
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| 摘 要： | 在单相Ll2结构Al67Mn8Ti25金属间化合物中加入少量Nb（0．5at％～4．0at％），并相应调整Al，Ti含量后，其组织变化显著。在邻近Al－Ti－Nb-8Mn四元系Al3Ti－8Mn区域设计了32种实验合金，随Nb加入量的变化，其结构除单相Ll2外，尚有Ll2＋A12Ti，L12＋DO22，LI2＋LI0，Ll2＋Al2Ti＋DO22和Ll2＋Al2Ti＋Ll0等5种复相或多相组织。Nb含量一定，随Al／Ti比的降低，会导致片状或网纹状Al2Ti组织析出，Nb含量较高时会进一步促使波纹或针片状Ll0TiAl相的形成。初步制定了Al－Ti－Nb-8Mn四元系邻近Al3Ti-8Mn区域的室温相组成图。
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| 关 键 词： | 金属间化合物 Al3Ti－8Mn 相图 铌 |
Effect of Nb Additions on Phase Formation in Ll_2 Type Al_3Ti-8Mn-based Alloys |
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| Shi Rong,Weng Xiaojun,Zhang Jinxu,Zhang Huiqiang,Fu Yunyi,Hu Gengxiang. Effect of Nb Additions on Phase Formation in Ll_2 Type Al_3Ti-8Mn-based Alloys[J]. Rare Metal Materials and Engineering, 1999, 28(6): 375-379 |
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| Authors: | Shi Rong Weng Xiaojun Zhang Jinxu Zhang Huiqiang Fu Yunyi Hu Gengxiang |
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| Abstract: | The microstructure of a monolithic Ll2Al67Mn8Ti25, compound changes significantly when modified with a small amount ofNb (0. 2~4. 0at%) and with corresponding adjustments to the Ti and Al contents. In 32 experimental alloys near the Al3Ti-8Mncomposition region of the Al-Ti-8Mn-Nb quaternary system, five multiphase regions. Ll2+Al2Ti, Ll2+DO22, Ll2+Ll0, Ll2,+Al2Ti+DO22 and Ll2+Al2Ti+Ll0 formed adjacent to the original Ll2 single phase. When Nb content keeps constant, the plate-like or nettyAl2Ti phase precipitates appear with the decrease of Al/Ti ratio. The ripple-like Ll0 AlTi phase may appear in the alloys containedhigher Nb c0ntents. A room temperature constitutional diagram near the Al3Ti-8Mn region of Al-Ti-Nb-8Mn quaternary system hasbeen determined. |
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| Keywords: | intermetallic alloy Al_3Ti-8Mn Al-Ti-Nb-8Mn constitutional diagram |
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