陈晶阳,曹腊梅,汤鑫,薛明

• 1:北京航空材料研究院先进高温结构材料重点实验室

摘要(Abstract)：

采用显微组织观察和JMat Pro相平衡计算和热力学模拟软件等手段研究了一种实验Ni_3Al基单晶高温合金的显微组织和1100℃/90 MPa条件下的持久高塑性变形行为,并分析了持久高塑性变形机制。实验Ni_3Al基单晶合金为γ/γ'两相组织,热处理后合金枝晶干部位γ'相的体积分数为86.0%,其形貌呈接近立方体形。JMat Pro软件在平衡相析出、γ/γ'相点阵常数和γ/γ'点阵错配度方面的计算结果与实验结果吻合的较好。合金1100℃/90 MPa的平均伸长率为148.5%,平均断面收缩率为72.3%。合金在持久变形过程中形成平行于应力轴方向的P型近似筏排组织使位错易于滑移传递从而在高温持久条件下表现出高塑性变形行为。

关键词(KeyWords)： Ni_3Al;单晶高温合金;显微组织;持久变形;高塑性

Abstract:

Keywords:

基金项目(Foundation): 国家高技术研究发展计划(2012AA03A511);; 北京市科技计划重大项目(Z131100006413005);; 航空科学基金(2015ZE21006)

作者(Author): 陈晶阳,曹腊梅,汤鑫,薛明

DOI: 10.13289/j.issn.1009-6264.2016.06.006

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