高稀土Mg-Gd合金半固态等温处理过程中微观组织演变
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摘要
针对稀土Gd含量较高的镁合金开展了半固态等温处理研究。结果表明,温度及保温时间对该合金半固态微观组织球化效果的影响作用明显。随着温度提高,Mg-Gd合金中的固相颗粒含量先增大后减小,主要是由于晶粒的长大趋势、晶界液相增多、晶粒内部液相相互连通分割等作用的结果,而晶粒的球化效果随着温度的增加及时间的延长而提高,其圆整度系数约为1.1。
Semi-solid isothermal treatment of magnesium alloys with high Gd content was investigated.The results reveal that temperature and holding time have the obvious effect on the spheroidization of its semi-solid microstructure.With the increase of temperature,the solid particles in the Mg-Gd alloy are increased firstly and then decreased,which is mainly attributed to the growth trend of grain size,increase of liquid phase in grain boundary,interconnection and segmentation of liquid phase inside grains.The spheroidization effect of grain presents desirable increasingly with the increase of temperature and time,and the roundness of the particles is about 1.1.
Semi-solid isothermal treatment of magnesium alloys with high Gd content was investigated.The results reveal that temperature and holding time have the obvious effect on the spheroidization of its semi-solid microstructure.With the increase of temperature,the solid particles in the Mg-Gd alloy are increased firstly and then decreased,which is mainly attributed to the growth trend of grain size,increase of liquid phase in grain boundary,interconnection and segmentation of liquid phase inside grains.The spheroidization effect of grain presents desirable increasingly with the increase of temperature and time,and the roundness of the particles is about 1.1.
引文
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[2]于建民,张治民,李旭斌,等.热处理工艺对Mg-Gd-Y-Nd-Zr合金组织和性能的影响[J].特种铸造及有色合金,2014,34(12):1 240-1 243.
[3]ALHAWARI K S,OMAR M Z,GHAZALI M J,et al.Microstructural evolution during semi-solid processing of Al-Si-Cu alloy with different Mg contents[J].Transactions of Nonferrous Metals Society of China,2017,27(7):1 483-1 497.
[4]孙兵,张英波,权高峰,等.AZ80镁合金半固态组织的等温演化研究[J].特种铸造及有色合金,2014,34(9):928-932.
[5]范俊凯,杨光昱,轩敏鑫,等.Mg-Zn-Gd镁合金SSIMA法等温半固态组织演变[J].特种铸造及有色合金,2014,34(8):816-820.
[6]CHEN Y S,ZHANG L,LIU W C,et al.Preparation of Mg-NdZn-(Zr)alloys semisolid slurry by electromagnetic stirring[J].Materials&Design,2016,95:398-409.
[7]ESMAILY M,MORTAZAVI N,SVENSSON J E,et al.A new semi-solid casting technique for fabricating SiC-reinforced Mg alloys matrix composites[J].Composites,2016,B94:176-189.
[8]张记宅,马颖,陈体军,等.半固态等温处理对AM60B镁合金组织的影响[J].特种铸造及有色合金,2009,29(4):337-340.
[9]HUANG W X,YAN H.Study on rheological model of semi-solid Al2Y/AZ91magnesium matrix composites slurry prepared by ultrasonic vibration[J].Rare Metal Materials and Engineering,2016,45:2 227-2 231.
[10]LIU W YANG D D,QUAN G F,et al.Microstructure evolution of semisolid Mg-2Zn-0.5Yalloy during isothermal heat treatment[J].Rare Metal Materials and Engineering,2016,45:1 967-1 972.
[11]CHEN Q,CHEN G,HAN L N,et al.Microstructure evolution of SiCp/ZM6(Mg-Nd-Zn)magnesium matrix composite in the semi-solid state[J].Journal of Alloys and Compounds,2016,656:67-76.
[12]SAMEER KUMAR D,SUMAN K N S,TARA SASANKA C,et al.Microstructure,mechanical response and fractography of AZ91E/Al2O3(p)nano composite fabricated by semi solid stir casting method[J].Journal of Magnesium and Alloys,2017(5):48-55.
[13]黄晓锋,郭峰,张玉,等.等温热处理对Mg-7Zn-0.3V合金半固态组织演变的影响[J].中国有色金属学报,2018,28(8):1 516-1 522.
[14]LIU J,WANG W X,ZHANG D J.Compression behavior of Al2O3sf/Mg-6Al-0.5Nd-1Gd composites fabricated by pressureless infiltration and semi-solid densification[J].Journal of Alloys and Compounds,2017,705:156-163.
[15]CHU C L,HU Z,LI X,et al.Evolution and distribution of Al2Sm phase in as-extruded AZ61-xSm magnesium alloys during semi-solid isothermal heat-treatment[J].Transactions of Nonferrous Metals Society of China,2018,28:1 311-1 320.
[16]CHEN G,ZHANG S,ZHANG H M,et al.Controlling liquid segregation of semi-solid AZ80magnesium alloy by back pressure thixoextruding[J].Journal of Materials Processing Technology,2018,259:88-95.
[17]LS L,WU S S,YANG X,et al.Microstructure and mechanical properties of Mg97Zn1Y2 alloy reinforced with LPSO structure produced by semisolid squeeze casting[J].Materials Science and Engineering,2018,A732:359-367.
[18]CHEN X R,JIA Y H,LIAO Q Y,et al.The simultaneous application of variable frequency ultrasonic and low frequency electromagnetic fields in semi continuous casting of AZ80magnesium alloy[J].Journal of Alloys and Compounds,2019,774:710-720.
[19]李亮,郑冕.镁合金AZ91D半固态浆料稳流变行为理论初探[J].辽宁工业大学学报(自然科学版),2016,36(6):393-396,400.
[20]吕然,邢博,杨宏贤,等.AM60镁合金制浆过程中保温参数对其半固态组织的影响[J].轻合金加工技术,2016,44(11):9-14.
[21]张世超,郑小平,陈连生,等.冷轧SIMA法制备镁合金半固态坯料的组织与性能[J].材料热处理学报,2016,37(4):50-54.
[22]赵敬红,李永磊.半固态AZ91D镁合金稳态流变理论模型的建立[J].机械工程师,2016(2):74-75.
[23]张倩倩.稀土元素钇对AM60镁合金铸态和半固态组织的影响[J].热加工工艺,2017,46(15):109-111.