Ll_2 金属間化合物の強さの結晶粒度依存性(変形組織と再結晶/結晶粒界)(<特集>再結晶・粒成長)

概要

論文の詳細を見る
Temperature dependence of strength in Ni_3Al and Ni_3Si with various grain sizes, 4 to 275 μm, are investigated through compression tests. The finer the grain size is, the positive temperature dependence of strength appears to be weaker. Thus HALL-PETCH parameter, k_y, for both alloys is evaluated at various test temperatures and is found to decrease above 200 K for Ni_3Si and 600 K for Ni_3Al. The apparent decrease in magnitude of the positive temperature dependence of strength in these alloys is then interpreted as stress relaxation which is found to become pronounced at higher test temperatures for finer grain sizes and for lower strain rates. It is concluded that grain boundary sliding is responsible for the stress relaxation and the activation energy for this thermally activated process is deduced to be 23 kJ/mol.
社団法人日本鉄鋼協会の論文
1984-11-01