首页> 外军国防科技报告 >High-Temperature Static Coarsening of Gamma-Prime Precipitates in NiAlCr-X Single Crystals (Postprint)
【2h】

High-Temperature Static Coarsening of Gamma-Prime Precipitates in NiAlCr-X Single Crystals (Postprint)

机译:NiAlCr-X单晶中γ-prime沉淀物的高温静态粗化(后印刷)

代理获取
代理获取并翻译 | 示例

摘要

The high-temperature coarsening behavior of gamma precipitates in a series of NiAlCr, NiAlCrTi, NiAlCrW, and NiAlCrTa single-crystal alloys was determined at temperatures between 1158 K 885C and 1473 K 1200C. For this purpose, samples were supersolvus solution treated, water quenched, and then subsolvus aged for times between 0.067 and 96 h. All of the measurements revealed an r3 dependence of the average precipitate radius on time, thus suggesting bulk-diffusion control of the coarsening process. Coarsening kinetics were fastest for NiCrAl and slowest for NiCrAlTa. The observations were interpreted in terms of the classical Lifshitz-Slyosov-Wagner LSW theory modified to account for the finite volume fraction of particles the composition of the precipitates, and the multicomponent nature of the alloys. By this means, an effective diffusivity for the coarsening process was determined and found to lie between 0.6 and 1.5 times that for the impurity diffusivity of chromium in nickel.

著录项

代理获取

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