胡心平,李瑞鑫,王 青.微量稀土钇对Al-7Si-0.3Mg铸造合金的强化及共晶转变温度影响研究[J].稀有金属材料与工程,2022,51(8):2947~2954.[Hu Xinping,Li Ruixin,Wang Qing.Effect of trace yttrium on strengthening and eutectic transformation temperature of casting Al-7Si-0.3Mg alloy[J].Rare Metal Materials and Engineering,2022,51(8):2947~2954.]
微量稀土钇对Al-7Si-0.3Mg铸造合金的强化及共晶转变温度影响研究
投稿时间:2021-07-11  修订日期:2021-08-29
中文关键词:  Al-7Si-0.3Mg合金  钇微合金化  共晶转变温度  断口分析  DSC分析
基金项目:山东省科技发展计划(项目号No. 2018GGX103012)
中文摘要:
      采用拉伸实验,硬度测试,微观组织OM及SEM(+EDS)分析,XRD,DSC等方法,研究了微量钇(含量分别为0.025%、0.05%、0.075%、0.1%)以及T6处理对铸造Al-7Si-0.3Mg合金的组织性能及其共晶转变温度的影响。拉伸实验和硬度测试实验表明,钇微合金化后的Al-7Si-0.3Mg合金的YS、UTS和El%均有所提高,而且,以0.05%Y含量的综合性能最佳。结合微观组织分析表明,强化相主要为Si相和Mg2Si相,且Mg2Si往往伴随着Si相存在。DSC分析表明,微含量X%(X=0.025%、0.05%、0.075%、0.1%)的钇使α_Al+β_Si→Liquid 反应温度下降(分别下降1.1℃、2.0℃、1.4℃、2.2℃),且使α_Al→Liquid反应温度有所提高;适量的钇促进α-Al异质形核基底的形成,且与βSi和Mg2Si等形成多元相,提高凝固时的过冷度。
Effect of trace yttrium on strengthening and eutectic transformation temperature of casting Al-7Si-0.3Mg alloy
英文关键词:Al-7Si-0.3Mg alloy  yttrium microalloying  eutectic transformation temperature  fracture analysis  DSC analysis
英文摘要:
      The effects of trace yttrium (yttrium content 0.025%, 0.05%, 0.075%, 0.1% respectively) and T6 treatment on the microstructure and properties, on the eutectic transformation temperature of Al-7Si-0.3Mg alloy were studied by tensile test, hardness test, microstructure analysis of OM, SEM (+EDS), XRD and DSC. The tensile test and hardness test showed that the YS, UTS and E1% of the aluminum alloy after yttrium microalloying were improved, and the comprehensive performance with 0.05%Y was the best among the designed aluminum alloys. The microstructure and composition analysis showed that the strengthening phases were mainly Si and Mg2Si phase, and Mg2Si phase usually appeared with Si phase. DSC analysis showed that the added yttrium decreased the transformation temperature of α_Al+β_Si→Liquid, and it decreased 1.1℃, 2.0℃, 1.4℃ and 2.2℃ respectively when 0.025%, 0.05%, 0.075% and 0.1% Y was added respectively. In addition, the transformation temperature of α_Al→Liquid was increased somewhat after Yttrium microalloyed. An appropriate amount of yttrium that formed multiple phases with βSi, Mg2Si and so on, which promoted the formation of heterogeneous nucleation substrate, and improved the supercooling in solidification.
作者单位E-mail
胡心平 齐鲁工业大学 机械与汽车工程学院 huxxpp@qlu.edu.cn 
李瑞鑫 齐鲁工业大学 机械与汽车工程学院  
王 青 山东省冶金科学研究院  
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