一种采用气冷搅拌杆流变压铸工艺制备的Al-8Si合金的组织与性能（英文）
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摘要
报道了一种新颖、高效的采用气冷搅拌杆制备半固态浆料的工艺,该工艺通过将压缩空气不断注入到搅拌杆内腔来冷却熔体。采用该工艺制备了一种新近研发的高导热Al-8Si合金半固态浆料,并将该工艺与高压铸造机结合生产出一种无线基站用薄壁散热壳体件。研究了气体流量对初生晶粒的形貌、流变压铸件的力学性能及导热系数的影响。结果表明:当气体流量超过3 L/s时,采用该工艺可以制备出优质的半固态浆料。当气体流量为5 L/s时,流变压铸件的力学性能和导热系数最高,分别为抗拉强度261 MPa,屈服强度124 MPa,伸长率4.9%,显微硬度HV 99和导热系数153 W/(m·K)。相比于传统压铸件,采用气冷搅拌杆流变压铸工艺生产的铸件力学性能和伸长率大大提高,其抗拉强度、屈服强度、伸长率、显微硬度和导热系数的增长率分别为20%、15%、88%、13%和10%。
A new and effective semisolid slurry preparation process with air-cooled stirring rod(ACSR) is reported, in which the compressed air is constantly injected into the inner cavity of a stirring rod to cool the melt. The slurry of a newly developed high thermal conductivity Al-8Si alloy was prepared, and thin-wall heat dissipation shells were produced by the ACSR process combined with a HPDC machine. The effects of the air flow on the morphology of α1-Al particles, mechanical properties and thermal conductivity of rheo-HPDC samples were studied. The results show that the excellent slurry of the alloy could be obtained with the air flow exceeding 3 L/s. Rheo-HPDC samples that were produced with the air flow of 5 L/s had the maximum UTS, YS, elongation, hardness and thermal conductivity of 261 MPa, 124 MPa, 4.9%, HV 99 and 153 W/(m·K), respectively. Rheo-HPDC samples show improved properties compared to those formed by HPDC, and the increasing rates of UTS, YS, elongation, hardness and thermal conductivity were 20%, 15%, 88%, 13% and 10%, respectively.
A new and effective semisolid slurry preparation process with air-cooled stirring rod(ACSR) is reported, in which the compressed air is constantly injected into the inner cavity of a stirring rod to cool the melt. The slurry of a newly developed high thermal conductivity Al-8Si alloy was prepared, and thin-wall heat dissipation shells were produced by the ACSR process combined with a HPDC machine. The effects of the air flow on the morphology of α1-Al particles, mechanical properties and thermal conductivity of rheo-HPDC samples were studied. The results show that the excellent slurry of the alloy could be obtained with the air flow exceeding 3 L/s. Rheo-HPDC samples that were produced with the air flow of 5 L/s had the maximum UTS, YS, elongation, hardness and thermal conductivity of 261 MPa, 124 MPa, 4.9%, HV 99 and 153 W/(m·K), respectively. Rheo-HPDC samples show improved properties compared to those formed by HPDC, and the increasing rates of UTS, YS, elongation, hardness and thermal conductivity were 20%, 15%, 88%, 13% and 10%, respectively.
引文
[1]JIANG Ju-fu,WANG Ying.Microstructure and mechanical properties of the semisolid slurries and rheoformed component of nano-sized Si C/7075 aluminum matrix composite prepared by ultrasonic-assisted semisolid stirring[J].Materials Science and Engineering A,2015,639:350-358.
[2]ZHOU Bing,KANG Yong-lin,ZHU Guo-ming,GAO Jun-zhen,QI Ming-fan,ZHANG Huan-huan.Forced convection rheoforming process for preparation of 7075 aluminum alloy semisolid slurry and its numerical simulation[J].Transactions of Nonferrous Metals Society of China,2014,24:1109-1116.
[3]SUI Yu-dong,WANG Qu-dong,YE Bing,ZHANG Li,JIANG Hai-yan,DING Wen-jiang.Effect of solidification sequence on the microstructure and mechanical properties of die-cast Al-11Si-2Cu-Fe alloy[J].Journal of Alloys and Compounds,2015,649:679-686.
[4]QI Ming-fan,KANG Yong-lin,ZHOU Bing,LIAO Wan-neng,ZHU Guo-ming,LI Yang-de,LI Wei-rong.A forced convection stirring process for Rheo-HPDC aluminum and magnesium alloys[J].Journal of Materials Processing Technology,2016,234:353-367.
[5]HU Zhao-hua,WU Guo-hua,ZHANG Peng,LIU Wen-cai,PANG Song,ZHANG Liang,DING Wen-jiang.Primary phase evolution of rheo-processed ADC12 aluminum alloy[J].Transactions of Nonferrous Metals Society of China,2016,26:19-27.
[6]QI Ming-fan,KANG Yong-lin,ZHOU Bing,ZHANG Huan-huan,ZHU Guo-ming.Microstructures and mechanical properties of A380aluminum alloy produced by rheo-diecasting process[J].The Chinese Journal of Nonferrous Metals,2015,25(8):2029-2039.(in Chinese)
[7]FLEMINGS M C.Behavior of metals in the semi-solid state[J].Metallurgical Transactions A,1991,22:957-981.
[8]CHEN Zheng-zhou,MAO Wei-min,WU Zong-chuang.Mechanical properties and microstructures of Al alloy tensile samples produced by serpentine channel pouring rheo-diecasting process[J].Transactions of Nonferrous Metals Society of China,2011,21:1473-1479.
[9]ZHAO Jun-wen,WU Shu-sen.Microstructure and mechanical properties of rheo-diecasted A390 alloy[J].Transactions of Nonferrous Metals Society of China,2010,20(S3):s754-s757.
[10]LIN Chong,WU Shu-sen,LV Shu-lin,AN Ping,WAN Li.Microstructure and mechanical properties of rheo-diecast hypereutectic Al-Si alloy with 2%Fe assisted with ultrasonic vibration process[J].Journal of Alloys and Compounds,2013,568:42-48.
[11]ZHOU Bing,KANG Yong-lin,QI Ming-fan,ZHANG Huan-huan,ZHU Guo-ming.R-HPDC process with forced convection mixing device for automotive part of A380 aluminum alloy[J].Materials,2014,7:3084-3105.
[12]ZHOU Bing,KANG Yong-lin,QI Ming-fan,ZHANG Huan-huan,ZHU Guo-ming.Microstructure and property of Rheo-diecasting magnesium-alloy with forced convection mixing process[J].Solid State Phenomena,2015,217-218:455-460.
[13]LIU Zhi-yong,MAO Wei-min,WANG Wei-pan,ZHENG Zhi-kai.Preparation of semi-solid A380 aluminum alloy slurry by serpentine channel[J].Transactions of Nonferrous Metals Society of China,2015,25:1419-1426.
[14]CHUNG I,BOLOURI A,KANG C.A study on semisolid processing of A356 aluminum alloy through vacuum-assisted electromagnetic stirring[J].The International Journal of Advanced Manufacturing Technology,2012,58:237-245.
[15]ZHANG Yang,WU Guo-hua,LIU Wen-cai,ZHANG Liang,PANG Song,DING Wen-jiang.Microstructure and mechanical properties of rheo-squeeze casting AZ91-Ca magnesium alloy prepared by gas bubbling process[J].Materials&Design,2015,67:1-8.
[16]ZHANG Qi,CAO Miao,CAI Jin.Al Si9Mg aluminum alloy semi-solid slurry preparation by intermediate frequency electromagnetic oscillation process[J].Journal of Materials Processing Technology,2015,215:42-49.
[17]QI Ming-fan,KANG Yong-lin,ZHOU Bing,ZHU Guo-ming,ZHANG Huan-huan,LI Yang-de.Effects of pouring temperature and cylinder temperature on microstructures and mechanical properties of rheomoulding AZ91D alloy[J].Transactions of Nonferrous Metals Society of China,2015,21:1473-1479.
[18]CHALMERS B.Principles of solidification[M].New York:John Wiley&Sons,1964.
[19]OHNO A.Solidification-the separation theory and its practical applications[M].Germany:Springer-Verlag Press,1987.
[20]YANG Liu-qing,KANG Yong-lin,ZHANG Fan,XU Jun.Microstructure and mechanical properties of rheo-diecasting AZ91D Mg alloy[J].Transactions of Nonferrous Metals Society of China,2010,20:862-867.
[21]HITCHCOCK M,WANG Y,FAN Z.Secondary solidification behaviour of the Al-Si-Mg alloy prepared by the rheo-diecasting process[J].Acta Materialia,2007,55:1589-1598.
[22]ZHOU Bing,KANG Yong-lin,QI Ming-fan,ZHANG Huan-huan,ZHU Guo-ming,WU Zheng-yang.Microstructure and tensile properties of AZ91D magnesium alloy by forced convection rheo-diecasting process[J].Journal of Materials Engineering,2014,10:1-5.
[23]ZHANG Y F,LIU Y B,CAO Z Y,ZHANG Q Q,ZHANG L.Mechanical properties of thixomolded AZ91D magnesium alloy[J].Journal of Materials Processing Technology,2009,209:1375-1384.
[24]GUAN Ren-guo,ZHAO Zhan-yong,CHAO Run-ze,ZHAO Hong-liang,LIU Chun-ming.Effects of technical parameters of continuous semisolid rolling on microstructure and mechanical properties of Mg-3Sn-1Mn alloy[J].Transactions of Nonferrous Metals Society of China,2013,23:73-79.
[25]KUBOTA K.,MABUCHI M.,HIGASHI K.Review processing and mechanical properties of fine-grained magnesium alloys[J].Journal of Materials Science,1999,34:2255-2262.
[26]ESMAILY M,SHAHABI-NAVID M,MORTAZAVI N,SVENSSON J E,HALVARSSON M,WESSEN M,JARFORS A E W,JOHANSSON L G.Microstructural characterization of the Mg-Al alloy AM50 produced by a newly developed rheo-casting process[J].Materials Characterization,2014,95:50-64.
[27]LV Shu-lin,WU Shu-sen,DAI Wei,LIN Chong,AN Ping.The indirect ultrasonic vibration process for rheo-squeeze casting of A356aluminum alloy[J].Journal of Materials Processing Technology,2012,212:1281-1287.
[2]ZHOU Bing,KANG Yong-lin,ZHU Guo-ming,GAO Jun-zhen,QI Ming-fan,ZHANG Huan-huan.Forced convection rheoforming process for preparation of 7075 aluminum alloy semisolid slurry and its numerical simulation[J].Transactions of Nonferrous Metals Society of China,2014,24:1109-1116.
[3]SUI Yu-dong,WANG Qu-dong,YE Bing,ZHANG Li,JIANG Hai-yan,DING Wen-jiang.Effect of solidification sequence on the microstructure and mechanical properties of die-cast Al-11Si-2Cu-Fe alloy[J].Journal of Alloys and Compounds,2015,649:679-686.
[4]QI Ming-fan,KANG Yong-lin,ZHOU Bing,LIAO Wan-neng,ZHU Guo-ming,LI Yang-de,LI Wei-rong.A forced convection stirring process for Rheo-HPDC aluminum and magnesium alloys[J].Journal of Materials Processing Technology,2016,234:353-367.
[5]HU Zhao-hua,WU Guo-hua,ZHANG Peng,LIU Wen-cai,PANG Song,ZHANG Liang,DING Wen-jiang.Primary phase evolution of rheo-processed ADC12 aluminum alloy[J].Transactions of Nonferrous Metals Society of China,2016,26:19-27.
[6]QI Ming-fan,KANG Yong-lin,ZHOU Bing,ZHANG Huan-huan,ZHU Guo-ming.Microstructures and mechanical properties of A380aluminum alloy produced by rheo-diecasting process[J].The Chinese Journal of Nonferrous Metals,2015,25(8):2029-2039.(in Chinese)
[7]FLEMINGS M C.Behavior of metals in the semi-solid state[J].Metallurgical Transactions A,1991,22:957-981.
[8]CHEN Zheng-zhou,MAO Wei-min,WU Zong-chuang.Mechanical properties and microstructures of Al alloy tensile samples produced by serpentine channel pouring rheo-diecasting process[J].Transactions of Nonferrous Metals Society of China,2011,21:1473-1479.
[9]ZHAO Jun-wen,WU Shu-sen.Microstructure and mechanical properties of rheo-diecasted A390 alloy[J].Transactions of Nonferrous Metals Society of China,2010,20(S3):s754-s757.
[10]LIN Chong,WU Shu-sen,LV Shu-lin,AN Ping,WAN Li.Microstructure and mechanical properties of rheo-diecast hypereutectic Al-Si alloy with 2%Fe assisted with ultrasonic vibration process[J].Journal of Alloys and Compounds,2013,568:42-48.
[11]ZHOU Bing,KANG Yong-lin,QI Ming-fan,ZHANG Huan-huan,ZHU Guo-ming.R-HPDC process with forced convection mixing device for automotive part of A380 aluminum alloy[J].Materials,2014,7:3084-3105.
[12]ZHOU Bing,KANG Yong-lin,QI Ming-fan,ZHANG Huan-huan,ZHU Guo-ming.Microstructure and property of Rheo-diecasting magnesium-alloy with forced convection mixing process[J].Solid State Phenomena,2015,217-218:455-460.
[13]LIU Zhi-yong,MAO Wei-min,WANG Wei-pan,ZHENG Zhi-kai.Preparation of semi-solid A380 aluminum alloy slurry by serpentine channel[J].Transactions of Nonferrous Metals Society of China,2015,25:1419-1426.
[14]CHUNG I,BOLOURI A,KANG C.A study on semisolid processing of A356 aluminum alloy through vacuum-assisted electromagnetic stirring[J].The International Journal of Advanced Manufacturing Technology,2012,58:237-245.
[15]ZHANG Yang,WU Guo-hua,LIU Wen-cai,ZHANG Liang,PANG Song,DING Wen-jiang.Microstructure and mechanical properties of rheo-squeeze casting AZ91-Ca magnesium alloy prepared by gas bubbling process[J].Materials&Design,2015,67:1-8.
[16]ZHANG Qi,CAO Miao,CAI Jin.Al Si9Mg aluminum alloy semi-solid slurry preparation by intermediate frequency electromagnetic oscillation process[J].Journal of Materials Processing Technology,2015,215:42-49.
[17]QI Ming-fan,KANG Yong-lin,ZHOU Bing,ZHU Guo-ming,ZHANG Huan-huan,LI Yang-de.Effects of pouring temperature and cylinder temperature on microstructures and mechanical properties of rheomoulding AZ91D alloy[J].Transactions of Nonferrous Metals Society of China,2015,21:1473-1479.
[18]CHALMERS B.Principles of solidification[M].New York:John Wiley&Sons,1964.
[19]OHNO A.Solidification-the separation theory and its practical applications[M].Germany:Springer-Verlag Press,1987.
[20]YANG Liu-qing,KANG Yong-lin,ZHANG Fan,XU Jun.Microstructure and mechanical properties of rheo-diecasting AZ91D Mg alloy[J].Transactions of Nonferrous Metals Society of China,2010,20:862-867.
[21]HITCHCOCK M,WANG Y,FAN Z.Secondary solidification behaviour of the Al-Si-Mg alloy prepared by the rheo-diecasting process[J].Acta Materialia,2007,55:1589-1598.
[22]ZHOU Bing,KANG Yong-lin,QI Ming-fan,ZHANG Huan-huan,ZHU Guo-ming,WU Zheng-yang.Microstructure and tensile properties of AZ91D magnesium alloy by forced convection rheo-diecasting process[J].Journal of Materials Engineering,2014,10:1-5.
[23]ZHANG Y F,LIU Y B,CAO Z Y,ZHANG Q Q,ZHANG L.Mechanical properties of thixomolded AZ91D magnesium alloy[J].Journal of Materials Processing Technology,2009,209:1375-1384.
[24]GUAN Ren-guo,ZHAO Zhan-yong,CHAO Run-ze,ZHAO Hong-liang,LIU Chun-ming.Effects of technical parameters of continuous semisolid rolling on microstructure and mechanical properties of Mg-3Sn-1Mn alloy[J].Transactions of Nonferrous Metals Society of China,2013,23:73-79.
[25]KUBOTA K.,MABUCHI M.,HIGASHI K.Review processing and mechanical properties of fine-grained magnesium alloys[J].Journal of Materials Science,1999,34:2255-2262.
[26]ESMAILY M,SHAHABI-NAVID M,MORTAZAVI N,SVENSSON J E,HALVARSSON M,WESSEN M,JARFORS A E W,JOHANSSON L G.Microstructural characterization of the Mg-Al alloy AM50 produced by a newly developed rheo-casting process[J].Materials Characterization,2014,95:50-64.
[27]LV Shu-lin,WU Shu-sen,DAI Wei,LIN Chong,AN Ping.The indirect ultrasonic vibration process for rheo-squeeze casting of A356aluminum alloy[J].Journal of Materials Processing Technology,2012,212:1281-1287.