CAJ | 학술논문

通过在搅拌摩擦加工(Friction Stir Processing,FSP)过程中填加微米级Ni粉的方法,利用Al、Ni在FSP条件下的快速原位反应,在Al合金1100-H14表面层获得Al_3Ni-Al复合体.采用SEM、EDS以及XRD对表面复合体微观结构及相组成进行分析,并对其显微硬度进行评测.结果表明,在FSP强烈的热、力耦合作用下,Ni粉产生了充分碎化,破碎后的Ni粒子与Al产生快速原位反应,生成亚微米甚至纳米级Al_3Ni颗粒,而少量微米级残留Ni颗粒被 Al_3Ni包裹,并与细小的Al_3Ni颗粒一同均匀分布于Al合金基体中,从而使得表面复合体的硬度显著提高,其平均值达到了818.3 MPa,为基体硬度的2.4倍.
통과재교반마찰가공(Friction Stir Processing,FSP)과정중전가미미급Ni분적방법,이용Al、Ni재FSP조건하적쾌속원위반응,재Al합금1100-H14표면층획득Al_3Ni-Al복합체.채용SEM、EDS이급XRD대표면복합체미관결구급상조성진행분석,병대기현미경도진행평측.결과표명,재FSP강렬적열、력우합작용하,Ni분산생료충분쇄화,파쇄후적Ni입자여Al산생쾌속원위반응,생성아미미심지납미급Al_3Ni과립,이소량미미급잔류Ni과립피 Al_3Ni포과,병여세소적Al_3Ni과립일동균균분포우Al합금기체중,종이사득표면복합체적경도현저제고,기평균치체도료818.3 MPa,위기체경도적2.4배.
By means of adding micron Ni powder in the Friction Stir Processing (FSP) period and the resultant rapid in-situ reaction between Al and Ni under FSP condition, Al_3Ni-Al composites were obtained on Al alloy 1100-H14 surface layer. The microstructures of the surface composites were analyzed by SEM and EDS, the phase composition was examined by XRD, and the microhardness was also measured. Results show that Ni powder was broken sufficiently under the severe thermal-mechanical coupling of FSP, and the broken Ni in-situ reacted with Al matrix rapidly to produce sub-micron or even nano particles of Al_3Ni; while a few micron particles of residual Ni were covered by Al_3Ni layer and homogeneously distributed in Al matrix with fine Al_3Ni particles. Therefore, the microhardness of the composites increased greatly and reached to 818.3 MPa, 2.4 times of that of Al alloy 1100-H14.