• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Symposium Proceedings vol.842; Symposium on Integrative and Interdisciplinary Aspects of Intermetallics; 20041129-1201; Boston,MA(US) >Massive Transformation in High Niobium Containing TiAl-Alloys
【24h】

Massive Transformation in High Niobium Containing TiAl-Alloys

机译：高铌TiAl合金的大规模转变

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

Massive transformation in high Nb bearing γ-TiAl-based alloys, Ti-45Al-7.5Nb and Ti-46Al-9Nb (at.%), and the thermal stability of the resulting microstructure were investigated. Using a quenching dilatometer, a nearly complete massive transformation in Ti-45Al-7.5Nb was found at about 1050℃ after annealing at 1305℃ for 10min and subsequent cooling with a rate of 55K/s. Higher starting temperatures and higher cooling rates lead to incomplete massive transformation and small transformed areas situated at the grain-boundary triple points of the parent α-grains are observed. By means of EBSD only in one case the same orientation of the close-packed planes of parent α-grains and of massively transformed γ_M-areas was observed. The thermal stability of the microstructure of massively transformed Ti-46Al-9Nb sheet material was tested by annealing samples for 1 hour between 400 and 1200℃. Above 800℃ a drop of hardness was measured and X-ray diffraction patterns show an increasing separation of (200)_γ and (002)_γ reflections as expected from a tetragonal γ-TiAl lattice. After annealing at 1100℃ α_2-phase segregates at grain boundaries and after 1200℃ α_2-lamellae appear insides the γ_M-grains parallel to all four {111}_γ-planes.
机译：研究了高Nb含量的γ-TiAl基合金Ti-45Al-7.5Nb和Ti-46Al-9Nb（原子％）的大规模转变以及所得组织的热稳定性。使用淬火膨胀计，在1305℃退火10分钟并随后以55K / s的速率冷却后，在1050℃附近发现了Ti-45Al-7.5Nb几乎完全的块状转变。较高的起始温度和较高的冷却速率导致不完全的大相变，并且观察到位于母体α晶粒的晶界三点处的小相变区域。仅在一种情况下，通过EBSD观察到了母体α颗粒和大量转变的γ_M区域的密堆积平面的相同方向。通过在400℃至1200℃之间将样品退火1小时，测试了大相变Ti-46Al-9Nb片材的显微组织的热稳定性。在800℃以上，测得硬度下降，并且X射线衍射图显示（200）_γ和（002）_γ反射与四边形γ-TiAl晶格的间距越来越大。在1100℃退火后，α_2相在晶界偏析；在1200℃退火后，α_2层出现在平行于所有四个{111}_γ平面的γ_M晶粒内部。

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