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王正军,张满,张秋阳,吕建强.复合细化变质多元铝硅合金强化机制的研究[J].稀有金属材料与工程(英文),2020,49(10):3402~3411.[Wang Zhengjun,Zhang Man,Zhang Qiuyang and Lv Jianqiang.Study on Strengthening Mechanism of Composite Refined and Modified Multi-component Aluminum-silicon Alloy[J].Rare Metal Materials and Engineering,2020,49(10):3402~3411.]
Study on Strengthening Mechanism of Composite Refined and Modified Multi-component Aluminum-silicon Alloy
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Received:October 07, 2019  Revised:December 10, 2019
DOI:
Key words: composite refine and modify  the second-phase particles  morphology distribution  Hall-Petch grain boundary fine grain strengthening  Orowan strengthening mechanism
Foundation item:国家自然科学基金项目( (No.51701079);淮阴工学院博士科研启动费基金(Z301B18558);江苏省产学研合作项目(FZ20190349)
Author NameAffiliation
Wang Zhengjun,Zhang Man,Zhang Qiuyang and Lv Jianqiang  
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Abstract:
      In order to improve the mechanical properties, a new Al-5Ti-1B-1RE master alloy refiner and Al-10Sr master alloy modifier were used to composite refine and modify the as-cast A356 aluminum alloy and a novel aluminum alloy composed of as-cast A356 aluminum alloy by adding Cu, Mn, Ti and other elements in a certain proportion. The morphology distribution of the second-phase particles and strengthening mechanism of the multi-component aluminum-silicon alloy were analyzed by means of OM, SEM, TEM and the electronic universal testing machine (CSS-44100).The results showed that the second-phase eutectic silicon phase in the A356 aluminum alloy transformed from coarse lamellar to typical fibrous phase after the composite refinement and modification, and precipitated uniformly at the grain boundary of the soft-tough phase α-Al matrix. The grain size of the α-Al phase decreased significantly. It was mainly Hall-Petch grain boundary fine grain strengthening mechanism. In addition to the second-phase particle eutectic silicon in the novel aluminum alloy, there were other second-phase particles which were more dispersed in the grain boundaries or intragranular. Various strengthening mechanisms worked together. When the second-phase particles were distributed on grain boundaries, it was mainly the Hall-Petch strengthening mechanism. When the second-phase particles were distributed in intragranular, it was mainly Orowan strengthening mechanism, which became an effective obstacle to dislocation movement and played a strengthening role.