| 1. | Microscopic heterogeneity and macroscopic mechanical behavior of a polycrystalline material
应力的不均匀性及宏观响应 |
| 2. | The impact of random grain boundary distribution and connectivity on intergranular fracture of polycrystalline materials
随机晶界分布和连通性对晶间破坏行为的影响 |
| 3. | The increase in average grain size of a polycrystalline material ; for most materials , an elevated - temperature heat treatment is necessary
多晶体材料中晶粒尺寸的增大，对大多数材料来说，晶粒长大只在升高温度加热的时候发生。 |
| 4. | The creep cavity location and damage of polycrystalline material was studied , and it was considered that there was a great correlation between the cavity sites , creep damage and grain size , and the damage often occurred in the location where grain size was small
摘要研究了多晶体材料在高温蠕变下的空洞出现位置和损伤特点，认为同一组织下空洞的出现及蠕变损伤的位置与晶粒尺寸有关系，晶粒尺寸小的部位易发生损伤。 |
| 5. | However , a thorough understanding of the properties and mechanisms of these materials is still lacking . in this paper , we discuss the properties observed in two kinds of half - metallic granular systems , powders and polycrystalline materials and propose two models to explain the experimental results
我们建立了一个由直接隧穿电导和cotunneling电导组成的网络模型，采用有效介质理论对该网络进行处理，同时还考虑了小尺寸颗粒的超顺磁行为对磁电阻的影响。 |
| 6. | Lacamno3 films were prepared on two different substrates ( srtio3 and laalo3 ) by excimer pulsed laser deposition method using the lacamno3 polycrystalline materials doped with 4wt % ag , which exhibits an excellent properties . a reliable process is obtained through repeated experiments and summaries
我们以优质掺ag4wt的lacamno _ 3多晶为靶材，利用准分子脉冲激光沉积法分别在srtio _ 3和laalo _ 3衬底上制备薄膜，经过摸索和实验，得到了较为成熟的工艺流程。 |
| 7. | Owing to the extremely small dimensions , nanometer materials are structurally characterized by a large volume fraction of grain boundaries or interphase boundaries , which exhibit some unique structural characteristics and novel properties with respect to the conventional coarsegrained polycrystalline materials
由于纳米粉体材料尺度极小，使之表面原子数、表面能急剧增加，产生了宏观物体所不具有的表面效应、小尺寸效应、量子效应及宏观量子隧道效应等新的性能。 |
