...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Philosophical Magazine Letters >The structure of primary strengthening precipitates in an Al-1.5wt% Cu-4.0wt% Mg-0.5wt% Ag alloy
【24h】

The structure of primary strengthening precipitates in an Al-1.5wt% Cu-4.0wt% Mg-0.5wt% Ag alloy

机译：Al-1.5wt％Cu-4.0wt％Mg-0.5wt％Ag合金中的一次强化析出结构

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Convergent-beam electron diffraction (CBED) has been used to study the primary strengthening precipitate phase (designated Z) in an alloy Al1.5 wt% Cu-4.0wt% Mg-0.5 wt% Ag, aged at 473 and 513K. The CBED patterns obtained from individual precipitates indicated that they have a cubic structure, with unit-cell parameter a 1 999 nm. The relative displacement of the first-order Laue zone net with respect to the zero-layer plane established a fcc Bravais lattice for the Z-phase; the whole pattern symmetry defined a point group m3m. Two orientation relationships were identified with the matrix-phase: (100)z(100), [010]z [010] and (011)z (0111) , (011)z (011) , the former being more dominant at shorter ageing times. Although earlier work on similar alloys suggested that these precipitates had the bcc T-phase structure of Bergman, Waugh and Pauling, the present results indicate that the Z-phase is not an isomorph of the T-phase that has been observed in the ternary Al-Zn-Mg and Al-Cu-Mg alloy systems. The Z-phase is also distinct from the metastable hexagonal X-phase that has been observed in the Al-Cu-Mg-Ag alloys which lie in the (alpha+S) -phase field, and which was also originally considered to be an isomorph of the T-phase of Bergman et al .
机译：会聚束电子衍射（CBED）已用于研究Al1.5 wt％Cu-4.0wt％Mg-0.5 wt％Ag合金（分别在473和513K时效）中的一次强化沉淀相（称为Z）。从单个沉淀物获得的CBED图谱表明它们具有立方结构，晶胞参数为1 999 nm。一阶Laue带网相对于零层平面的相对位移为Z相建立了fcc Bravais晶格;整个图形的对称性定义了一个点组m3m。矩阵相位确定了两个方向关系：（100）z（100），[010] z [010]和（011）z（0111），（011）z（011），前者在较短时占主导地位老化时间。尽管早期对类似合金的研究表明这些沉淀物具有Bergman，Waugh和Pauling的bcc T相结构，但目前的结果表明Z相不是三元Al中观察到的T相的同构。 -Zn-Mg和Al-Cu-Mg合金体系。 Z相也不同于在（α+ S）相场中的Al-Cu-Mg-Ag合金中观察到的亚稳态六角形X相，该相最初也被认为是Bergman等人的T相的同构。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号