| 镍基单晶蠕变研究：试验、机理及本构模型 |
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| 引用本文： | 白露.镍基单晶蠕变研究：试验、机理及本构模型[J].航空动力学报,2009,24(9). |
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| 作者姓名： | 白露 |
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| 作者单位： | 北京航空航天大学能源与动力工程学院 |
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| 摘 要： | 本文为镍基单晶合金高温蠕变建模研究工作的第一部分，通过对DD6镍基单晶合金不同中断时间的高温蠕变试验及透射电镜（TEM）观察，结合单晶合金蠕变机理的研究成果阐明了单晶高温蠕变的机理，并从Orowan方程出发，在晶体塑性理论框架下建立描述晶体滑移系上位错演化规律的方程，发展了以位错密度变化表征镍基单晶高温蠕变的本构模型。该模型考虑了较宽温度与载荷范围内单晶的主要蠕变机理，可较好地建模750℃～1100℃范围内镍基单晶的各向异性蠕变行为。
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| 关 键 词： | 镍基单晶 蠕变 位错密度 本构模型 滑移系 |
| 收稿时间： | 9/20/2008 8:34:53 PM |
Creep of Ni-based single crystal superalloy : experiment, mechanism and the constitutive mode |
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| Bai Lu.Creep of Ni-based single crystal superalloy : experiment, mechanism and the constitutive mode[J].Journal of Aerospace Power,2009,24(9). |
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| Authors: | Bai Lu |
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| Institution: | BeiHing University School of Jet Propusion |
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| Abstract: | A new creep model of Ni-based single crystal superalloy is presented. Differential constitutive equations are based on transmission electron microscope (TEM) observation from creep experiment of single superalloy DD6 and mechanisms of single crystal superalloys generation 1 and 2. The non-linear equation developed under the system of crystal plasticity and derived from Orowan equation and evolution of dislocation density which develop during the creep deformation process with effect of resolve stress level on slip system and temperature. Typical curves shape obtained by the present approach are calculated with wide range of temperature and load in different orientations to demonstrate the validity of the proposed model. |
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| Keywords: | Ni-based single crystal superalloy creep dislocation constitutive model slip sytems |
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