Influence of Elastic Energies on the Changes in Precipitation Structures in Fe-Base Ordering Alloys.

弹性能对铁基有序合金中析出结构变化的影响。

• 批准号: 03650574
• 负责人: DOI Minoru
• 金额: $ 1.28万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650574/
• 关键词: Fe-Base Alloy; Ordered Phase; Elastic Energy; Elastic Interaction; Precipitate Coarsening; Structural Bifurcation; Splitting; 折出物粗大化; 弾性エネルギ-

(1) In weakly constrained systems such as D0_3 in Fe-Al-Ge, particles coarsen as the cube root of the ageing time t, i.e. the so-called 't^<1/3>-law' holds, and the size distribution is scaled with respect to the mean particle size. The coarsening obeys the conventional coarsening theory such as the LSW theory of Ostwald ripening.(2) In strongly constrained systems such as D0_3 in Fe-Al-V, D0_3 in Fe-Si-V and B2 in Fe-Al-Co, the particle coarsening proceeds more slowly than the prediction of the LSW theory, and the scaling rule does not hold. Furthermore, the splitting of single particle into a doublet or to the octet is sometimes observed.(3) Such unusual coarsening behavior in strongly constrained systems can only be explained by the new coarsening theory named Bifurcation theory in which not only the surface energy but also the elastic energies are considered as the driving force for coarsening.(4) Coarsening behavior of coherent precipitates in Fe-base alloys is quite similar to that of gamma'-precipitates in Ni-base alloys. It is very likely that unusual behavior peculiar to the elastically constrained systems should be universal regardless of crystal structure.(5) It is very likely that the two-phase alloys having highly stable structure can be obtained with controlling the elastic constraint, i.e. the ratio of lattice misfit to surface energy.

(1)在弱约束体系中，如Fe-Al-Ge中的D0_3中，颗粒的粗化程度为时效时间t的立方根，即所谓的“t^<1/3>定律”成立，粒径分布相对于平均粒径按比例缩放。粗化遵循传统的粗化理论，如奥斯特瓦尔德成熟的LSW理论。(2)在Fe-Al-V中的D0_3、Fe-Si-V中的D0_3和Fe-Al-Co中的B2等强约束体系中，颗粒粗化过程比LSW理论预测的要慢，标度规则不成立。此外，有时还观察到单粒子分裂成双重态或八重体。(3)强约束系统中这种不寻常的粗化行为只能用一种新的粗化理论来解释，即分岔理论，该理论不仅认为表面能是粗化的驱动力，而且认为弹性能也是粗化的驱动力。(4)铁基合金中共格相的粗化行为与镍基合金中γ′相的粗化行为非常相似。无论晶体结构如何，弹性约束体系特有的不寻常行为很可能是普遍存在的。(5)通过控制弹性约束，即控制晶格失配与表面能的比值，很有可能获得结构高度稳定的两相合金。

项目成果

M.Doi: "A New parameter for Describing the Structure Bifurcation in Two Phase Alloys Containing Coherent Particles." Journal of Materials Science.

M.Doi：“描述包含相格粒子的两相合金中结构分岔的新参数。”

Minoru Doi: "A New Parameter for Describing the Structure Bifurcation in Two-Phase Alloys Containing Coherent Particles" Journal of Materials Science. 27. 6291-6298 (1992)

Minoru Doi：“描述包含相干粒子的两相合金结构分岔的新参数”材料科学杂志。

M. Doi: "Coarsening Behavior of Coherent Precipitates in Elastically Constrained Systems - With Particular Emphasis on Gamma-Prime Precipitates in Nickel-Base Alloys -" Mater. Trans. JIM. 33. 637-649 (1992)

M. Doi：“弹性约束系统中相干析出物的粗化行为 - 特别强调镍基合金中的伽玛质析出物 -”Mater。

M. Doi and T. Miyazaki: "Coarsening Behavior of Coherent Precipitates in Ni-Base Alloys. [in Japanese]" Rep. Toyota Phys. Chem. Res. Inst.44. 27-34 (1991)

M. Doi 和 T. Miyazaki：“镍基合金中相干沉淀物的粗化行为。[日语]”丰田物理研究所代表。

Minoru Doi: "Coarsening Behaviour of Coherent Precipitates in Elastically Constrained Systems-With Particular Emphasis on Gmma-Prime Precipitates in Nickel-Base Alloys-." Materials Transactions.JIM. 33. 637-649 (1992)

Minoru Doi：“弹性约束系统中相干析出物的粗化行为——特别强调镍基合金中的 Gmma 质析出物——”。