Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
高村 三郎; 小桧山 守*
日本金属学会会報, 29(6), p.422 - 429, 1990/06
低温で中性子照射したAl、Cu、Ag合金について内部摩擦、弾性率測定を行い、外国で行われた内部摩擦、超音波吸収実験と比較した。また複合体の構造計算と比較して、溶質原子の大きさが溶媒原子より大きい場合と小さい場合に別けて調べ、Al合金ではアンダーサイズの溶質原子の時にはミックスダンベル型、オーバーサイズでは単一格子間原子-溶質原子複合体をもつと考えた。Cu,Ag合金では、複雑な複合体構造をもつと考えた。
鈴木 秀次
Journal of the Physical Society of Japan, 17(2), p.322 - 325, 1962/00
被引用回数：219抄録なし
Zhang, Y.*; 梅田 岳昌*; 諸岡 聡; 宮本 吾郎*; 古原 忠*
no journal, ,
Essential understanding of the pearlite growth kinetics is of great significance to predict the lamellar spacing and the resultant mechanical properties of pearlitic steels. In this study, a series of eutectoid steels with Mn addition up to 2mass% were isothermally transformed at a temperature range from 873K to 973K to investigate the growth kinetics and the underlying thermodynamics at the migrating interface during pearlite transformation. The microscopic observation revealed that the pearlite growth rate in each alloy becomes increased while the lamellar spacing becomes decreased by lowering the transformation temperature. Mn addition decelerates the growth rate, accompanied by a relatively wider lamellar spacing at each temperature. After analyzing the element distribution in the vicinity of migrating austenite/pearlite interface via three-dimensional atom probe, Mn was found to be enriched at the austenite/pearlitic ferrite interface, whereas the Mn partitioning among the three phases is negligibly small in the 2mass% Mn added alloy isothermally transformed at 873K. Based on the estimation of energy dissipated by various factors, the driving force for pearlite transformation in the Mn-free alloy was found to be consumed by interface friction, carbon partitioning and ferrite/cementite interfacial energy, whereas neutron diffraction analysis indicated that the influence of transformation strain is relatively small. The retardation effects of pearlite growth kinetics in the Mn-added alloy, which is partly due to the reduced driving force for pearlite transformation, can be well explained by further considering the energy dissipation caused by solute drag effects of Mn.
