镍基单晶高温合金沉淀相尺度效应研究  

Influence of Precipitate Size on the Strength of Nickel-Base Single Crystal Superalloys

作　　者：王佰智[1] 温志勋[1] 刘大顺[1] 岳珠峰[1] 

机构地区：[1]西北工业大学,陕西西安710129

出　　处：《稀有金属材料与工程》2015年第11期2747-2750,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51375388;51210008)

摘　　要：对Ni3Al（γ’）沉淀相尺寸对镍基单晶高温合金拉伸性能的影响进行了研究。对镍基单晶高温合金而言,材料的屈服来源于位错以Orowan机制绕过沉淀相,而Orowan应力与沉淀相间距有关。根据这一机理,基于晶体塑性理论,引入一个本构方程以表征沉淀相尺寸对镍基单晶高温合金屈服强度的影响。采用该本构模型,分别计算了在[001]以及[111]2个取向下,含有尺寸为0.22.5μm沉淀相的镍基单晶高温合金屈服强度,并与试验结果进行了对比验证。结果表明,该模型可以准确表征镍基单晶高温合金沉淀相的尺度效应。The influence of Ni3Al（γ’） precipitate size on the tensile properties of nickel-base single crystal superalloys was studied.For single crystal superalloys,the main contribution to the yield stress arises from the Orowan stress in the γ channels.According to Orowan mechanism,a constitutive model based on crystal plastic theory was introduced to characterize the influence of precipitate size on the yield strength of single crystal superalloys.The tensile simulations of[001]and[111]oriented specimens were carried out.The yield strength of single crystal superalloys with precipitate size varying from 0.2 to 2.5 μm was calculated and the simulation results agree with the experiments.This constitutive model is shown to accurately simulate the size effects in the nickel-base single crystal superalloys.

关 键 词：镍基单晶高温合金 本构模型 Orowan应力 晶体塑性 尺度效应 

分 类 号：TG132.3[一般工业技术—材料科学与工程]