纳米TiC_P对2024合金流动性及力学性能的影响
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摘要
研究了纳米TiC颗粒(TiC_p)对2024铝合金流动性及力学性能的影响。试验结果表明,原始2024合金铸态组织呈粗大枝晶状,流动性差,存在浇不足、热裂等铸造缺陷。以Al-TiC晶种合金的形式添加0.1%TiC_p后,2024合金晶粒形貌得到改善,粗大枝晶生长被抑制,流动性显著提高,螺旋流动性试样平均长度由556 mm提高至696 mm,提高约25.2%;合金的力学性能明显提高,硬度、抗拉强度和伸长率分别为HBW120.5、365 MPa和2.08%,较原始2024合金分别提高5.6%、8.6%和40.5%。
The influences of nano-TiC particle(TiC_p) on the fluidity and mechanical properties of 2024 alloy were investigated. The results show that the as-cast microstructure of the original 2024 alloy is in the morphology of coarse dendrites, the alloy has poor fluidity, and is prone to casting defects such as misrun and hot cracking. When 0.1% TiC_P is added in the 2024 alloy in the form of Al-TiC master alloy, the growth of coarse dendrites in the 2024 alloy is suppressed, and the grain morphology and the fluidity of the alloyare significantly improved. The average length of the spiral fluidity sample is increased from 556 mm to 696 mm, with an increment of approx. 25%. Furthermore, the mechanical properties of the alloy is obviously improved; the hardness, ultimate tensile strength and elongation of the alloy are HBW120.5, 365 MPa and 2.08%, which are increased by 5.6%, 8.6% and 40.5%, respectively, compared to the original 2024 alloy.
The influences of nano-TiC particle(TiC_p) on the fluidity and mechanical properties of 2024 alloy were investigated. The results show that the as-cast microstructure of the original 2024 alloy is in the morphology of coarse dendrites, the alloy has poor fluidity, and is prone to casting defects such as misrun and hot cracking. When 0.1% TiC_P is added in the 2024 alloy in the form of Al-TiC master alloy, the growth of coarse dendrites in the 2024 alloy is suppressed, and the grain morphology and the fluidity of the alloyare significantly improved. The average length of the spiral fluidity sample is increased from 556 mm to 696 mm, with an increment of approx. 25%. Furthermore, the mechanical properties of the alloy is obviously improved; the hardness, ultimate tensile strength and elongation of the alloy are HBW120.5, 365 MPa and 2.08%, which are increased by 5.6%, 8.6% and 40.5%, respectively, compared to the original 2024 alloy.
引文
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[3]刘伯操,郎业方,杨长贺.铸造手册:铸造非铁合金[M].北京:机械工业出版社,2001.
[4]张海珍,白培康,杨晶.高性能铝铜合金铸造性能的研究[J].热加工工艺,2010,39(1):64-66.
[5]起华荣,杨钢,史庆南,等.A356合金流动性测试研究[J].轻金属,2008(1):52-54.
[6]刘相法,边秀房.铝合金组织细化用中间合金[M].长沙:中南大学出版社,2012.
[7]Ding H,Liu X,Yu L,et al.The influence of forming processes on the distribution and morphologies of TiC in Al-Ti-C master alloys[J].Scripta Materialia,2007,57(7):575-578.
[8]Yang H,Gao T,Wang H,et al.Influence of C/Ti stoichiometry in TiCx on the grain refinement efficiency of Al-Ti-C master alloy[J].Journal of Materials Science&Technology,2017,33(7):616-622.
[9]Zhou D S,Tang J,Qiu F,et al.Effects of nano-TiCpon the microstructures and tensile properties of TiCp/Al-Cu composites[J].Materials Characterization,2014,94:80-85.
[10]刘景苑.内生高体积分数TiCx/TiCx-TiB2增强2014铝基复合材料的组织与性能[D].长春:吉林大学,2014.
[11]周东帅.纳米TiCp/Al-Cu复合材料制备和组织与力学性能的研究[D].长春:吉林大学,2014.
[12]赵传江.纳米TiCp/Al-Cu基复合材料的摩擦磨损行为[D].长春:吉林大学,2016.
[13]杨平莉,杨军,陈美玲.TiC粉体影响铝铜合金凝固组织的数值模拟研究[J].铸造,2016,65(1):56-59.
[14]Feng X,Liu H,Babu S S.Effect of grain size refinement and precipitation reactions on strengthening in friction stir processed Al-Cu alloys[J].Scripta Materialia,2011,65(12):1057-1060.
[15]Dalen M E V,Dunand D C,Seidman D N.Effects of Ti additions on the nanostructure and creep properties of precipitation-strengthened Al-Sc alloys[J].Acta Materialia,2005,53(15):4225-4235.
[16]王海超.Al-Ti-C/B中间合金对变形铝合金晶粒形貌及挤压行为的影响[D].济南:山东大学,2017.