Ultralow-Temperature Superplasticity in Nanoceramic Composites
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- 作者：Guo-Dong Zhan ; Javier E. Garay ; and Amiya K. Mukherjee
- 刊名：Nano Letters
- 出版年：2005
- 出版时间：December 2005
- 年：2005
- 卷：5
- 期：12
- 页码：2593 - 2597
- 全文大小：287K
- 年卷期：v.5,no.12(December 2005)
- ISSN：1530-6992
文摘
We report the successful demonstration for low-temperature and high-strain-rate superplastic forming of nanoceramic composites for the firsttime. Porous preforms of nanoceramic composites that were partially densifed at low temperatures were superplastically defomed by SPS atthe record low temperatures of ~1000 to 1050 
C, which are comparable to those of Ni-based superalloys. The maximum strain rate achievedis over 10-2 s-1, and a compressive strain over 200% can be obtained without cracking. The final products have nanosized grains withexcellent optical properties. The present findings present a new strategy for nanoceramic superplasticity, demonstrating that a more practicalapplication of nanoceramic superplasticity is not in the shaping of already-dense materials but in the near-net-shape forming of partiallydense parts.
C, which are comparable to those of Ni-based superalloys. The maximum strain rate achievedis over 10-2 s-1, and a compressive strain over 200% can be obtained without cracking. The final products have nanosized grains withexcellent optical properties. The present findings present a new strategy for nanoceramic superplasticity, demonstrating that a more practicalapplication of nanoceramic superplasticity is not in the shaping of already-dense materials but in the near-net-shape forming of partiallydense parts.