Yield stress of fine grained materials

✍ Scribed by R.A. Masumura; P.M. Hazzledine; C.S. Pande

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 300 KB
• Volume: 46
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/s1359-6454(98)00150-5

✦ Synopsis

AbstractÐA model is proposed for the yield stress of ultra-®ne grained materials based upon Coble creep. Using Coble creep with a threshold stress for ®ner grains and conventional Hall±Petch strengthening for larger grains, an analytical relation is derived for the yield stress as a function of grain size for a range from very large to very small. A grain size distribution is incorporated into the analysis to account for a distribution of grain sizes occurring in most specimens. This result is compared with experimental data from Cu and NiP and shown to be in good agreement.