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细观非均质性对镍基单晶双相合金塑性行为的影响
引用本文:郭运强 张克实 耿小亮 刘芹. 细观非均质性对镍基单晶双相合金塑性行为的影响[J]. 稀有金属材料与工程, 2007, 36(8): 1331-1335
作者姓名:郭运强 张克实 耿小亮 刘芹
作者单位:1. 西北工业大学,陕西,西安,710072
2. 广西大学,广西,南宁,530004
基金项目:国家自然科学基金;航空基础科学基金
摘    要:建立了考虑背应力演化和损伤演化的晶体塑性模型,利用所建立的晶体塑性模型研究了应变速率对镍基单晶合金基体相、强化相的影响。结果表明,镍基单晶基体相和强化相均表现出明显的率相关性。单晶双相合金的细观非均质性导致非均匀的微观应力和微观塑性滑移。塑性滑移变形首先发源于基体相。微观应力和塑性滑移的非均匀性可能是材料微观损伤积累和孔洞形核的根源。

关 键 词:晶体塑性理论  镍基双相合金  强化相  细观非均质性
文章编号:1002-185X(2007)08-1331-05
修稿时间:2006-07-29

Influence of Heterogeneous Microstructure on the Plastic Behavior of Single Crystal Dual Phase Ni-base Superalloy
Guo Yunqiang,Zhang Keshi,Geng Xiaoliang,Liu Qin. Influence of Heterogeneous Microstructure on the Plastic Behavior of Single Crystal Dual Phase Ni-base Superalloy[J]. Rare Metal Materials and Engineering, 2007, 36(8): 1331-1335
Authors:Guo Yunqiang  Zhang Keshi  Geng Xiaoliang  Liu Qin
Abstract:A theory of crystal plasticity including back stress and damage evolutions has been established in this paper. The effects of strain rate on the matrix and precipitate phases of Ni-base superalloy have been analyzed using the theory. The computational result revealed that the both matrix and precipitate phases were seriously affected by strain rate. The nonuniform microcosmic stresses and plastic slips were induced by the microcosmic heterogeneity of single crystal dual phase alloy. The microcosmic plastic slips originate in matrix firstly. The heterogeneity of microcosmic stresses and plastic slips is probably the origin of the damage evolution and the nucleation of micro voids.
Keywords:crystal plasticity theory   Ni-base dual phase superalloy   precipitate   heterogeneous microstructure
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