The above ”Hall-Petch Symposium” will be held in Tokyo under the auspices
of Japan Society of Promotion of Science (JSPS) as a commemorative event
of 50-year anniversary of the 133rd Committee of University-Industry Cooperation
of JSPS. The organizers solicit contributions by active researchers in
this field all over the world, so that the symposium be quite fruitful
in serving for the further development of science and technology of fine-grained
Dates: from July 16 (Tue) to July 18 (Thu) in 2013
Venue: SANJO Conference Hall, The University of Tokyo, Tokyo
Scope: Since E. O. Hall (1951) and N. J. Petch (1953) proposed the following
σy = σ0 + kd‒1/2
for the grain-size (d) dependence of the yield strength (σy) of steels, the equation has been shown to be valid for a variety of crystalline solids, and this equation is known as the Hall-Petch law or the Hall-Petch relation. The same equation has been shown to hold for the flow stress and fracture strength of metallic materials. Therefore, grain refining has been used as a powerful tool of strengthening and toughening of crystalline materials without changing the composition. Since 1990s, however, it has been found that when grain size decreases below, say, 20 nm, the Hall-Petch law becomes no more valid and the strength even decreases with decreasing the grain size, now termed as the inverse Hall-Petch behavior.
Nearly 60 years have passed since the Hall-Petch relation was established.
At this stage, it seems quite meaningful to review the present state of
the art of the Hall-Petch and the inverse Hall-Petch relations from experimental
and theoretical viewpoints to understand the role of grain boundaries in
the mechanical properties of polycrystalline materials and to carry out
the optimum design of structural materials.
・Inverse Hall-Petch relation
・Strength of fine-grained steels
・Strength of fine-grained non-ferrous metals
・Strength of fine-grained ceramics
・Grain boundary segregation and its effects on strength
Abstract: March 31, 2013
Registration: June 15, 2013
July 31, 2013
The deadline of abstract submisson was originally Jan. 31, 2013. However,
the organizing committee has decided to postpone the deadline until March
31, 2013, in order to have more participants in this unique symposium,
particularly from young generation, who are currently engaged in research
in this field. To encourage students' contribution, the organizing committee
has decided to select some excellent posters among those presented by students
to award them the Best Poster Prize.
Those who have already submitted an abstract may substitute the original
one by the revised one by March 31, 2013.