Development of Microstructure-controlled L1_2-type High Temperature Intermetallics

微观结构控制的L1_2型高温金属间化合物的研制

基本信息

批准号：
01850166
负责人：
NEMOTO Minoru
金额：
$ 6.4万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

Experimental studies were made on the microstructure control of gamma'-Ni_3A1 based intermetallics mainly by means of transmission electron microscopy. Results are as follows.1. Precipitation of disordered gamma phase in an Ll_2 ordered gamma'-Ni_3 (Al, Ti) phase. A uniform solid solution of gamma'-Ll_2 ordered phase supersaturated with Ni can be obtained annealing in a suitable temperature range.2. Deformation induced microstructure of Ll_2 ordered gamma'-Ni_3 (Al, Ti) single crystals containing fine dispersion of disordered gamma precipitates. Superlattice dislocations dissociate into fourfold Schockley partial dislocations in a uniform supersaturatred solid solution of the gma' phase.3. Hardening mechanisms in a gamma'-Ll_2 ordered phase containing disordered gamma precipitates. Extra work necessary to pull out the dislocations from the precipitate is dependent on the difference in antiphase boundary energy between the matrix and the precipitates.4. Temperature dependence of the yie … More ld stress in gamma'-Ll_2 ordered Ni_3 (Al, Ti) single crystals containing disordered gamma precipitates. The strength of gamma'-Ni_3 (Al, Ti) increases over the temperature range of experiment by the precipitation of fine gamma particles.5. Orientation dependence of the yield stress in gamma'-Ll_2 ordered Ni_3 (Al, Ti) single crystals containing disordered gamma precipitates. The critical resolved shear stress for (111) [101] slip decreases with increasing temperature in the temperature range where (111) slip operates.6. Dislocation structures in high temperature deformed Ni_3 (Al, Ti) single crystals containing disordered gamma precipitates. The super dislovations are strongly attracted to the disordered particles and dissociate on the (111) plane in the matrix.7. Precipitation in Ll_2-Ordered Ni-Al-Cr alloys. By aging at temperatures around 1073 K after solution treatment at 1423 K, fine polyhedral precipitates appear firstly on the dislocations and then in the matrix. The selected area electron diffraction studies revealed that these particles are a M_<23>C_6 type carbide. Less

对基于γ-NI_3A1的微观结构控制进行了实验研究，主要是通过透射电子显微镜进行的。结果如下1。 LL_2订购的伽玛 - ni_3（al，ti）相中的无序伽马相的沉淀。可以在合适的温度范围内获得γ'-ll_2有序相位过饱和的伽马'-ll_2的均匀固体溶液。2。变形诱导的LL_2的微观结构有序的伽马 - ni_3（al，Ti）单晶，含有无序伽玛精度的精细分散体。在GMA'相的均匀超饱和固体溶液中，超晶格位错分解为四倍的Schockley局部位错。3。 γ'-ll_2中的硬化机制有序相，含有无序的伽玛精度。从珍贵中拉出位错所需的额外工作取决于矩阵和精度之间的反相边界能量的差异4。 YIE的温度依赖性…γ'-ll_2中的更多LD应力有序的Ni_3（Al，Ti）单晶含有无序的伽马沉淀物。通过细γ颗粒的精确度5。 γ'-ll_2中屈服应力的定向依赖性有序的ni_3（al，ti）含有无序伽玛沉淀物的单晶。（111）[101]的临界解析剪切应力随温度范围内的温度升高而降低，其中（111）滑动操作6。高温变形的Ni_3（Al，Ti）中的位错结构，其中包含无序的伽马沉淀物。超级厌恶被无序颗粒被强烈吸引，并在矩阵中的（111）平面上解离。 LL_2订购的NI-AL-CR合金中的降水。通过在1423 K进行溶液处理后的温度下衰老，在1423 K溶液处理后，良好的多面体沉淀物首先出现在位错上，然后出现在基质中。选定的区域电子衍射研究表明，这些颗粒是M_ <23> C_6型碳化物。较少的