【摘要】 为了研究纳米晶Al-Ti-B细化剂对活塞用ZL109合金耐磨性的影响,本文首先对Al-Ti-B中间合金进行了熔体快淬处理,得到了薄丝带状的Al-Ti-B中间合金,通过TEM分析可知,其为纳米晶组织,然后采用金属熔融鳞造法,用纳米晶Al-Ti-B中间合金对ZL109合金进行了细化处理;最后进行了磨损试验。研究表明,纳米晶Al-Ti-B中间合金使ZL109的组织得到了很好的细化,硬度、耐磨性均明显提高。硬度(HBS)由125提高到132,提高了5．6％,磨损率由2．012％降为0．389 4％,从而明显提高了抗磨损性能。由此得出,用快速凝固的方法对Al-Ti-B晶粒细化剂进行预处理．可以有效地提高ZL109合金的抗磨损性能。更多还原

【Abstract】 In order to study the effect of nanocrystal Al-Ti-B refiner on wear resistance of ZL109, Al-Ti-B master alloy was firstly prepared using melt-spin method, and it is found that melt-spin ribbon of Al-Ti-B master alloy has nanosized grains though TEM analysis. Subsequently, ZL109 alloy was treated by Al-Ti-B master alloy using molten metal casting method, and wear test was finally carried out. The results show that the nanometer Al-Ti-B alloy can refine the microstructure of ZL109 significantly, thus the hardness and wear resistance increase obviously. The hardness increases from 125 to 132, increased by 5.6% ,wear rate decreases from 2.012% to 0.389 4%. Therefore, the wear resistance of ZL109 can be improved effectively if Al-Ti-B alloy was pretreated using melt-spin method before refinement.更多还原