复合变质与热处理对Al-18Si-4Cu-0.5Mg合金组织和性能的影响
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摘要
采用室温拉伸实验、金相组织观察和扫描电镜观察研究了复合变质处理和T6热处理对过共晶Al-18Si-4Cu-0. 5Mg合金力学性能和显微组织的影响。结果表明,过共晶Al-18Si-4Cu-0.5Mg合金经P-RE-Sr复合变质处理后,初晶硅由粗大不规则板块状细化为细小片状,尺寸明显减小,共晶硅由细长针状转变为珊瑚状、短棒状和蠕虫状,经T6热处理后,初晶硅尺寸无明显变化,共晶硅发生熔断、球化;经P-RE-Sr复合变质处理后,抗拉强度由222MPa提高至236MPa,延伸率由3.22%提高至4.03%;复合变质合金经T6热处理后,抗拉强度大幅度提高,提高至320MPa,但延伸率略有下降,下降至3.37%。
In this paper,the effects of complex modification and T6 heat treatment on microstructure and mechanical properties of Al-18Si-4Cu-0.5Mg alloy are studied by means of room temperature tensile test,metallographic observation and SEM observation.The results indicats that primary Si is refined from coarse irregular polygonal shape to fine flake shape,and eutectic Si is significantly modified from coarse needle-like to fine rod-like and coral-like after P-RE-Sr complex modification.However,primary Si has no obvious change and eutectic Si is dissolved and broken and spheroidized with T6 heat treatment.The ultimate tensile strength is increased from 222 MPa to 236 MPa and the elongation is increased from 3.22%to 4.03%after P-RE-Sr complex modification.After T6 heat treatment,the tensile strength of the composite modified alloy is greatly improved to320MPa,but the elongation decreased slightly to 3.37%.
In this paper,the effects of complex modification and T6 heat treatment on microstructure and mechanical properties of Al-18Si-4Cu-0.5Mg alloy are studied by means of room temperature tensile test,metallographic observation and SEM observation.The results indicats that primary Si is refined from coarse irregular polygonal shape to fine flake shape,and eutectic Si is significantly modified from coarse needle-like to fine rod-like and coral-like after P-RE-Sr complex modification.However,primary Si has no obvious change and eutectic Si is dissolved and broken and spheroidized with T6 heat treatment.The ultimate tensile strength is increased from 222 MPa to 236 MPa and the elongation is increased from 3.22%to 4.03%after P-RE-Sr complex modification.After T6 heat treatment,the tensile strength of the composite modified alloy is greatly improved to320MPa,but the elongation decreased slightly to 3.37%.
引文
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[3]戴建营,肖冬玲.汽车发动机缸套用铝硅合金的变质处理[J].铸造技术,2014(8):1872-1874.
[4]王锋,迟长志,台立民,等.铝硅合金变质处理研究现状[J].热加工工艺,2016(11):9-10.
[5] Jiang W,Fan Z,Chen X,et al. Combined effects of mechanicalvibration and wall thickness on microstructure and mechanicalproperties of A356 aluminum alloy produced by expendable patternshell casting[J]. Materials Science&Engineering A,2014,619(4):228-237..
[6]周运海,程和法,陈文珂,等.近液相线法制备A390合金显微组织的演变[J].特种铸造及有色合金,2013,33(1):21-24.
[7]党博,坚增运,常芳娥,等.熔体温度处理对Al-25%Si合金凝固特性及组织的影响[J].铸造,2015,64(8):789-795.
[8]Vijeesh V,Prabhu K N. The Effect of Chilling and Ce Addition on theMicrostructure and Mechanical Properties of Al-23Si Alloy[J].Journal of Materials Engineering&Performance,2017,26:1-7.
[9]Kaur P,Dwivedi D K,Pathak P M. Effects of electromagnetic stirringand rare earth compounds on the microstructure and mechanicalproperties of hypereutectic Al–Si alloys[J]. The InternationalJournal of Advanced Manufacturing Technology,2012,63(1-4):415-420.
[10]李龙,薛喜丽,周德敬. Na变质处理对Al-10.5Si合金共晶硅尺寸及性能的影响[J].铸造,2017,66(8):854-858.
[11] Liu G,Li G,Cai A,et al. The influence of Strontium addition onwear properties of Al–20 wt%Si alloys under dry reciprocatingsliding condition[J]. Materials&Design,2011,32(1):121-126.
[12]亓四华. Al-P中间合金细化变质过共晶铝硅合金显微组织研究[J].热加工工艺,2014(15):101-102.
[13]Kilicaslan M F,Lee W R,Lee T H,et al. Effect of Sc addition on themicrostructure and mechanical properties of as-atomized and extrudedAl–20Si alloys[J]. Materials Letters,2012,71(71):164-167.
[14]曹明,林继兴,章海彪.混合稀土变质对A390铝合金组织的影响[J].热加工工艺,2012,41(23):36-38.
[15]闫洪,张敬奇,张苏.稀土对铝合金变质处理的研究进展[J].材料导报,2013,27(s2):285-287.
[16]Heo J Y,Gwon J H,Park J K,et al. Effects of Heat Treatment on theMicrostructures and High Temperature Mechanical Properties ofHypereutectic Al–14Si–Cu–Mg Alloy Manufactured by LiquidPhase Sintering Process[J]. Metals&Materials International,2018,24(3):586-596.
[17]梁超,刘保串,祝攀拓,等.熔体混合与T6热处理对多元高硅铝硅合金组织和耐磨性能的影响[J].铸造,2016,65(8):725-728.