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《中国航空学报(英文版)》 2018-01
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Influence of TiB_2 particles on machinability and machining parameter optimization of TiB_2/Al MMCs

Ruisong JIANG;Xinfa CHEN;Renwei GE;Wenhu WANG;Guodong SONG;The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology,Ministry of Education,Northwestern Polytechnical University;China Academy of Engineering Physics;  
In situ formed TiB_2 particle reinforced aluminum matrix composites(TiB_2/Al MMCs)have some extraordinary properties which make them be a promising material for high performance aero-engine blade.Due to the influence of TiB_2 particles, the machinability is still a problem which restricts the application of TiB_2/Al MMCs.In order to meet the industrial requirements, the influence of TiB_2 particles on the machinability of TiB_2/Al MMCs was investigated experimentally.Moreover, the optimal machining conditions for this kind of MMCs were investigated in this study.The major conclusions are:(1) the machining force of TiB_2/Al MMCs is bigger than that of nonreinforced alloy and mainly controlled by feed rate;(2) the residual stress of TiB_2/Al MMCs is compressive while that of non-reinforced alloy is nearly neutral;(3) the surface roughness of TiB_2/Al MMCs is smaller than that of non-reinforced alloy under the same cutting speed, but reverse result was observed when the feed rate increased;(4) a multi-objective optimization model for surface roughness and material removal rate(MRR) was established, and a set of optimal parameter combinations of the machining was obtained.The results show a great difference from Si C particle reinforced MMCs and provide a useful guide for a better control of machining process of this material.
【Fund】: co-supported by the National Natural Science Foundation of China(No.51505387);; the China Postdoctoral Science Foundation funded project(No.2016M602860);; the 111 project(No.B13044)
【CateGory Index】: V257
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