CAJ | 학술논문

利用TEM研究弥散Al_2O_3粒子对变形Cu-Al_2O_3弥散强化铜合金高温退火显微组织的影响.结果表明:弥散强化铜合金等时(1 h)退火时,显微硬度HV呈缓慢下降趋势,没有发生突降现象;弥散铜高温退火主要以位错亚结构回复为主,而亚晶较为少见;粒子弥散参数和胞壁性质对退火时的回复产生非常重要的影响;Al_2O_3弥散粒子影响位错在胞壁内的运动,阻碍胞壁内位错重排、迁移,使得胞壁很难通过运动而获得位向差的积累,从而阻碍大角晶界的形成;随合金中弥散粒子含量的增大和粒子间距的减小,亚晶形核更加困难;Cu-Al_2O_3合金冷轧过程中形成的胞组织的胞壁具有较小的平均位向差,导致弥散铜合金高温退火时难以形成具有明晰边界的亚晶组织.
이용TEM연구미산Al_2O_3입자대변형Cu-Al_2O_3미산강화동합금고온퇴화현미조직적영향.결과표명:미산강화동합금등시(1 h)퇴화시,현미경도HV정완만하강추세,몰유발생돌강현상;미산동고온퇴화주요이위착아결구회복위주,이아정교위소견;입자미산삼수화포벽성질대퇴화시적회복산생비상중요적영향;Al_2O_3미산입자영향위착재포벽내적운동,조애포벽내위착중배、천이,사득포벽흔난통과운동이획득위향차적적루,종이조애대각정계적형성;수합금중미산입자함량적증대화입자간거적감소,아정형핵경가곤난;Cu-Al_2O_3합금랭알과정중형성적포조직적포벽구유교소적평균위향차,도치미산동합금고온퇴화시난이형성구유명석변계적아정조직.
The effect of Al_2O_3 disperoid on the dislocation structure of deformed and annealed Cu-Al_2O_3 alloys at elevated temperature was studied by TEM. The results show that the microhardness (HV) of the Cu-Al_2O_3 alloys decreases slowly with increasing annealing temperature under the condition of the same annealing time (1 h). The annealing microstructure features with a large amount of dislocation cells and few subgrains. The dispersion parameters and the nature of cell wall have a significant effect on the recovery of dislocation cells. The Al_2O_3 particle dispersion can interfere with the movement and rearrangement of dislocations in the cell walls. The prevention of long range motion of dislocations prohibits the accumulation of misorientation of the cell walls and then inhibits the formation of the high angle boundaries. The formation of subgrains becomes more difficult with the increase of the concentration of Al_2O_3 particle and decrease of the interparticle spacing. The cell walls formed in the as deformed alloys are of small average misorientation. As a result, the formation of well-defined subgrains is difficult during the annealing.