首页|超高强Ti-15Mo-2.7Nb-3Al-0.2Si钛合金的强化行为及模型

超高强Ti-15Mo-2.7Nb-3Al-0.2Si钛合金的强化行为及模型

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基于XRD、OM、SEM和TEM分析,研究超高强Ti-15Mo-2.7Nb-3Al-0.2Si钛合金的组织演变及强化行为.结果表明,位错强化和析出强化效应对该合金的屈服强度影响较大.冷轧+再结晶+冷轧+双时效组合工艺可获得1518 MPa的最高屈服强度,这主要归因于显微组织中的高密度残存位错及密集而细小的次生α相.建立复合强化模型,其预测误差在16.6％以内.此外,研究发现次生α相体积分数的增加可以不断强化晶内区域,这使得沿晶断裂开始出现并逐渐占据整个断裂面.
Strengthening behavior and model of ultra-high strength Ti-15Mo-2.7Nb-3Al-0.2Si titanium alloy
The microstructure evolution and strengthening behavior of the ultra-high strength Ti-15Mo-2.7Nb-3Al-0.2Si titanium alloy were studied utilizing XRD,OM,SEM,and TEM analyses.The results show that the dislocation-strengthening and precipitation-strengthening effects could mostly affect the yield strength of this alloy.The highest yield strength of 1518 MPa was obtained under a combined process of cold rolling+recrystallization+cold rolling+duplex aging.This trend is mainly due to the high density of remaining dislocations,as well as dense and thin secondary α phases in microstructures.A theoretical composite-strengthening model was built,and the prediction error is within 16.6％.Furthermore,it is found that increasing the content of the secondary α phase can continuously strengthen the intragrain zone.This feature causes the intergranular fracture to appear and gradually dominate the fracture surface.

strengthening modelultra-high strengthstrengthening behaviortitanium alloyTi-15Mo-2.7Nb-3Al-0.2Si

石晓辉、张琪、荆镇、范智渊、刘江林、乔珺威

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太原理工大学材料科学与工程学院,太原 030024

太原理工大学机械与运载工程学院,太原 030024

强化模型 超高强 强化行为 钛合金 Ti-15Mo-2.7Nb-3Al-0.2Si

Fundamental Research Program of Shanxi Province国家自然科学基金国家自然科学基金

2022030212111305180113252075359

2024

10.1016/S1003-6326(23)66459-3

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(4)
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