搅拌时间对Al-Fe-Si/Al原位复合材料的影响  

Effect of Stirring Time on Al-Fe-Si/Al In-situ Composite

作　　者：姜羡[1] 江其阳 熊光耀[1] 赵龙志[1] 

机构地区：[1]华东交通大学机电工程学院,江西南昌330013

出　　处：《热加工工艺》2016年第22期127-131,共5页Hot Working Technology

基　　金：国家自然科学基金(51465019;51165008);江西省科技厅科研项目(20132BBE5006;20142BDH80004);江西省教育厅科研项目(GJJ12691和KJLD14040);华东交通大学科研基金资助(11JD05)

摘　　要：采用搅拌铸造法制备了Al-Fe-Si/Al原位复合材料。利用X射线衍射仪、扫描电镜、能谱仪、光学显微镜、XHV-1000数字式显微硬度计和M2000型磨损试验机研究了搅拌时间对原位复合材料微观结构、硬度和耐磨性的影响。结果表明:随搅拌时间的增加,Al_(13)Fe_4相消失,原位复合材料中β-Al_5FeSi相逐渐由长针状长大成粗棒状,最后长大成块状;维氏硬度呈先上升后下降的趋势;磨损率则先下降后上升。当搅拌时间为8 min时,复合材料硬度最高为111.5HV,约为纯铝的3倍,约为ZL102的1.5倍;该复合材料的耐磨性最好,磨损率为0.231%,约为纯铝的10倍,约为ZL102的7.4倍;该复合材料的磨损机制为磨粒磨损。Al-Si-Fe/Al in-situ composite was prepared by stir casting method. The influences of stirring time on the microstructure, hardness and wear resistance of in-situ composite were investigated by X-ray diffraction, scanning electron microcopy, energy dispersive spectroscopy, optical microscope, XHV-1000 digital microhardness tester and M2000 wear tester. The results show that with the increase of stirring time, Al13Fe4 phases disappear, the β-Al5FeSi phases gradually grow into a thick plate from a long needle and then, grow into the lump at last in in-situ composite. The vickers hardness has a trend of first increase and then decrease.The wear rate has a trend of first decrease and then increase. When stirring time is 8 min, the hardness of the composite has a peak value （111.5 HV）, which is 3 times than that of pure aluminum and 1.5 times than that of ZL102. The wear resistance of the composite is the best （wear rate of 0.231%）, which is 10 times than that of pure aluminum and 7.4 times than that of ZL102. The wear mechanism of the composite is mainly abrasive wear.

关 键 词：搅拌铸造 原位 搅拌时间 微观结构 硬度 磨损率 

分 类 号：TB331[一般工业技术—材料科学与工程]