Sc、Zr、Ti复合合金化对过共晶铝铁合金组织及性能的影响
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摘要
本文通过改变合金元素的加入量和熔体保温时间,研究了不同合金元素Sc、Zr、Ti对过共晶Al-Fe合金微观组织及力学性能的影响,重点研究了Sc、Zr、Ti在过共晶Al-5%Fe合金中的溶质分布规律。
Sc、Zr、Ti合金化元素对初生Al_3Fe相的生长有重要的影响。在过共晶Al-5%Fe合金中加入微量Sc,在加入量为0.4%、保温时间为30min时效果较好,合金中的初生Al_3Fe相由粗大的针状基本转变为细小的针状、粒状和花朵状。合金的抗拉强度达到186.2MPa,提高了53.4%。Sc元素吸附在富Fe区周围,阻碍Fe原子迁移,增加界面前沿液相中Fe的浓度梯度,造成了成分过冷,使初生Al_3Fe相得到细化。在过共晶Al-5%Fe合金中加入微量Zr,在加入量为0.1%、保温时间为90min时效果较好,合金中的初生Al_3Fe相基本转变为花朵状和粒状。合金的抗拉强度达到177.9MPa,提高了46.5%。Zr在过共晶Al-5%Fe中一部分固溶于铝基体中,一部分固溶到Al_3Fe相中,通过原子占位抑制初生Al_3Fe相的择优生长,使之细化。微量元素Ti对过共晶Al-5%Fe合金的细化作用在加入量为0.3%、保温时间为30min时效果较好,初生Al_3Fe相变为短针状和花朵状,合金的抗拉强度达到146.6MPa,提高了20.8%。
Sc、Zr复合对过共晶Al-5%Fe合金的细化作用在Sc、Zr加入量分别为0.3%和0.1%、熔体保温时间为30min时效果较好,初生Al_3Fe相转变为细小的针状,粒状和花朵状。合金的抗拉强度达到266.8MPa,提高了119.8%。Sc、Ti复合对过共晶Al-5%Fe合金的细化作用,在Sc、Ti加入量分别为0.25%和0.04%、熔体保温时间为30min时效果较好,初生Al_3Fe相转变为细小的针状和花朵状。合金的抗拉强度达到185.2MPa,提高了52.6%。
Sc、Zr、Ti复合时,当添加量分别为0.4%Sc、0.2%Zr和0.2%Ti时初生Al_3Fe相主要以圆整的小颗粒状为主,同时还有少量的花朵状和细小的短针状初生Al_3Fe相存在。
By changing the contents of minor elements and the holding time of molten melts,the influences of trace elements Sc、Zr、Ti on the microstructure and mechanical properties of hypereutectic Al-Fe alloy were investigated in the paper.The regularities of solute redistribution of the trace elements in the hypereutectic Al-5%Fe alloy were studied.
The alloying elements of Sc,Zr and Ti have important effects on the growth of primary Al_3Fe phase.In the hypereutectic Al-5%Fe alloy,the optimal refining effect was attained when 0.4%Sc was individually added and the melt was holding for 30 minutes. The primary Al_3Fe phase changed from the shape of coarse needles to fine needle-like, particle-like and flower-like.The tensile strength of the alloy approached to 186.2MPa, being raised 53.4%.The element Sc is rich in the Fe-rich area,disturbing the transportation of Fe atoms and increasing the concentration gradient of Fe on the solidification interface, thus promoting the constitutional supercooling and refining the primary Al_3Fe phase.In the hypereutectic Al-5%Fe alloy,the optimal refining effect was attained when 0.1%Zr was individually added and the melt was holding for 90 minutes.The primary Al_3Fe phase was fundamentally changed to be particle-like and flower-like.The tensile strength of the alloy was up to 177.9MPa,being raised 46.5%.Part of the Zr element is dissolved in the Al-matrix and the other is dissolved in the Al_3Fe phase.They suppress the preferential growth of Al_3Fe phase by means of atom occupying space.Therefore,the primary Al_3Fe phase is refined.In the hypereutectic Al-5%Fe alloy,the optimal refining effect was attained when 0.3%Ti was individually added and the melt was holding for 30 minutes. The primary Al_3Fe phase changed to be fine needle-like and flower-like.The tensile strength of the alloy approached to 146.6MPa,being raised 20.8%.
In the hypereutectic Al-5%Fe alloy,the optimal refining effect was attained when 0.4%Sc and 0.1%Zr were added and the melt was holding for 30 minutes.The primary Al_3Fe phase changed to be fine needle-like,particle-like and flower-like.The tensile strength of the alloy approached to 266.8MPa,being raised 119.8%.In the hypereutectic Al-5%Fe alloy,the optimal refining effect was attained when 0.25%Sc and 0.04%Ti were added and the melt was holding for 30 minutes.The primary Al_3Fe phase changed to be fine needle-like,and flower-like.The tensile strength of the alloy approached to 185.2MPa, being raised 52.6%.
When 0.4%Sc,0.2%Zr and 0.2%Ti were simultaneously added,the primary Al_3Fe phase was appeared mainly to be particle-like,and small amounts of Al_3Fe phase was fine needle-like and flower-like.
Sc、Zr、Ti合金化元素对初生Al_3Fe相的生长有重要的影响。在过共晶Al-5%Fe合金中加入微量Sc,在加入量为0.4%、保温时间为30min时效果较好,合金中的初生Al_3Fe相由粗大的针状基本转变为细小的针状、粒状和花朵状。合金的抗拉强度达到186.2MPa,提高了53.4%。Sc元素吸附在富Fe区周围,阻碍Fe原子迁移,增加界面前沿液相中Fe的浓度梯度,造成了成分过冷,使初生Al_3Fe相得到细化。在过共晶Al-5%Fe合金中加入微量Zr,在加入量为0.1%、保温时间为90min时效果较好,合金中的初生Al_3Fe相基本转变为花朵状和粒状。合金的抗拉强度达到177.9MPa,提高了46.5%。Zr在过共晶Al-5%Fe中一部分固溶于铝基体中,一部分固溶到Al_3Fe相中,通过原子占位抑制初生Al_3Fe相的择优生长,使之细化。微量元素Ti对过共晶Al-5%Fe合金的细化作用在加入量为0.3%、保温时间为30min时效果较好,初生Al_3Fe相变为短针状和花朵状,合金的抗拉强度达到146.6MPa,提高了20.8%。
Sc、Zr复合对过共晶Al-5%Fe合金的细化作用在Sc、Zr加入量分别为0.3%和0.1%、熔体保温时间为30min时效果较好,初生Al_3Fe相转变为细小的针状,粒状和花朵状。合金的抗拉强度达到266.8MPa,提高了119.8%。Sc、Ti复合对过共晶Al-5%Fe合金的细化作用,在Sc、Ti加入量分别为0.25%和0.04%、熔体保温时间为30min时效果较好,初生Al_3Fe相转变为细小的针状和花朵状。合金的抗拉强度达到185.2MPa,提高了52.6%。
Sc、Zr、Ti复合时,当添加量分别为0.4%Sc、0.2%Zr和0.2%Ti时初生Al_3Fe相主要以圆整的小颗粒状为主,同时还有少量的花朵状和细小的短针状初生Al_3Fe相存在。
By changing the contents of minor elements and the holding time of molten melts,the influences of trace elements Sc、Zr、Ti on the microstructure and mechanical properties of hypereutectic Al-Fe alloy were investigated in the paper.The regularities of solute redistribution of the trace elements in the hypereutectic Al-5%Fe alloy were studied.
The alloying elements of Sc,Zr and Ti have important effects on the growth of primary Al_3Fe phase.In the hypereutectic Al-5%Fe alloy,the optimal refining effect was attained when 0.4%Sc was individually added and the melt was holding for 30 minutes. The primary Al_3Fe phase changed from the shape of coarse needles to fine needle-like, particle-like and flower-like.The tensile strength of the alloy approached to 186.2MPa, being raised 53.4%.The element Sc is rich in the Fe-rich area,disturbing the transportation of Fe atoms and increasing the concentration gradient of Fe on the solidification interface, thus promoting the constitutional supercooling and refining the primary Al_3Fe phase.In the hypereutectic Al-5%Fe alloy,the optimal refining effect was attained when 0.1%Zr was individually added and the melt was holding for 90 minutes.The primary Al_3Fe phase was fundamentally changed to be particle-like and flower-like.The tensile strength of the alloy was up to 177.9MPa,being raised 46.5%.Part of the Zr element is dissolved in the Al-matrix and the other is dissolved in the Al_3Fe phase.They suppress the preferential growth of Al_3Fe phase by means of atom occupying space.Therefore,the primary Al_3Fe phase is refined.In the hypereutectic Al-5%Fe alloy,the optimal refining effect was attained when 0.3%Ti was individually added and the melt was holding for 30 minutes. The primary Al_3Fe phase changed to be fine needle-like and flower-like.The tensile strength of the alloy approached to 146.6MPa,being raised 20.8%.
In the hypereutectic Al-5%Fe alloy,the optimal refining effect was attained when 0.4%Sc and 0.1%Zr were added and the melt was holding for 30 minutes.The primary Al_3Fe phase changed to be fine needle-like,particle-like and flower-like.The tensile strength of the alloy approached to 266.8MPa,being raised 119.8%.In the hypereutectic Al-5%Fe alloy,the optimal refining effect was attained when 0.25%Sc and 0.04%Ti were added and the melt was holding for 30 minutes.The primary Al_3Fe phase changed to be fine needle-like,and flower-like.The tensile strength of the alloy approached to 185.2MPa, being raised 52.6%.
When 0.4%Sc,0.2%Zr and 0.2%Ti were simultaneously added,the primary Al_3Fe phase was appeared mainly to be particle-like,and small amounts of Al_3Fe phase was fine needle-like and flower-like.
引文
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[14]覃红侠,谢赞华,宋治鉴等.快凝粉末Al-10Fe-1V-2Si-0.5Re耐热铝合金.材料科学与工艺,1997,5(2):29-32.
[15]董寅生,沈军,杨英俊等.快速凝固Al-Fe-Cu-V-Si-Ni-Ce-Zr合金的组织.中国有色金属学报,1999,9(增刊1):153-157.
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[17]杨光照,魏伯康,徐自立等.离心铸造铝铁基梯度功能材料的组织形态及控制.特种铸造及有色合金,1997,(2):11-14.
[18]于思荣,任露泉,张新平等.Al-10%Fe合金梯度材料的组织与性能.金属功能材料,2000,7(6):5-10.
[19]Christian J,Simensen,Ramasamy Vellasamy.Determination of Phases Present in Casting Material of an Al-0.5wt%Fe-0.2wt%Si Alloy.Z.Metallkde.1977,(68):428-431.
[20]周振平,李荣德.Mn和Mg对Al-5Fe合金初生Al_3Fe相形貌的影响.金属学报,2003,39(6):608-612.
[21]周振平,李荣德.Al-5%Fe合金的热速处理研究.铸造技术,2004,25(6):427-429.
[22]周振平,李荣德,马建超.热速处理对Al-Fe合金组织与性能的影响.中国有色金属学报,2004,14(8):1420-1425.
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