Study on the high cycle fatigue properties of in-situ TiB2/7050 composite

被引：0
|
作者：
Duan M. [1 ]
Li C. [2 ]
Li B. [1 ]
Li Y. [1 ]
机构：
[1] School of Aeronautics, Northwestern Polytechnical University, Xi'an
[2] National Key Laboratory of Science and Technology on Liquid Rocket Engines, Xi'an Aerospace Propulsion Institute, Xi'an
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 11期
关键词：
aluminum matrix composite; high cycle fatigue; in-situ particle reinforcment; notch effect; particle strengthening;
D O I：
10.13801/j.cnki.fhclxb.20230112.001
中图分类号：
学科分类号：
摘要：
In-situ TiB2/Al composite is a new type of aluminum matrix composite, which has the advantages of high specific strength and specific stiffness, good performances on wear resistance, electrical conductivity and thermal conductivity, a variety of matrix alloy candidates, low raw material cost, simple and diversified manufacturing and heat treatment processes. The existing research on the fatigue of in-situ TiB2/Al composites mainly focuses on the strengthening mechanism in micro-scale and the general understanding of its fatigue performance is not sufficient. It is also lack of fatigue test data of in-situ TiB2/Al composite for the engineering use. High cycle fatigue properties of the in-situ TiB2 particle reinforced 7050 aluminum alloy composite (in-situ TiB2/7050-Al) with volume fraction of 3.67vol% was experimentally investigated with comparison to 7050-Al, the matrix alloy of the composite. The results reveal that the fatigue strength of the in-situ TiB2/7050-Al is apparently higher than that of 7050-Al. The fatigue limits of in-situ TiB2/7050-Al are improved by 24.59% and 13.56% for stress ratios 0.1 and 0.5 separately, resulting from the increase of fatigue resistance induced by the tiny TiB2 particles. The results at different stress concentration levels show that the notch sensitivity of in-situ TiB2/7050-Al is higher than that of 7050-Al, which may attribute to TiB2 particles impeding the plastic deformation of the aluminum alloy matrix in the composite. Despite the higher notch sensitivity, the fatigue resistance of the notched composite is still higher than that of the 7050-Al. Therefore, in-situ TiB2/7050-Al is a promising material for lightweight structure application to replace traditional aluminum alloy in certain circumstances and achieve the joint improvement of static strength and fatigue performance. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：6430 / 6438
页数：8
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