CAJ | 학술논문

对铸态AZ31镁合金进行不同变形量的锻造或压缩室温变形,然后经过不同温度和时间的退火保温,研究孪晶界对合金静态再结晶过程的影响.结果表明,锻造产生的孪晶较短且取向错乱,而压缩变形产生的孪晶则较狭长,同取向的孪晶大量聚集、平行排列,这与锻造和压缩两种变形方式的形变速率不同有关.退火保温实验结果表明,在相同条件下,锻造变形镁合金孪晶处比压缩变形镁合金孪晶处更易发生再结晶.研究不同孪晶处的形核方式,提出低温“孪晶界凸出形核”机理,发现某些孪晶变体即二次孪晶处并不是优先形核的位置,这与经典的孪生形核理论的观点不同.
대주태AZ31미합금진행불동변형량적단조혹압축실온변형,연후경과불동온도화시간적퇴화보온,연구련정계대합금정태재결정과정적영향.결과표명,단조산생적련정교단차취향착란,이압축변형산생적련정칙교협장,동취향적련정대량취집、평행배렬,저여단조화압축량충변형방식적형변속솔불동유관.퇴화보온실험결과표명,재상동조건하,단조변형미합금련정처비압축변형미합금련정처경역발생재결정.연구불동련정처적형핵방식,제출저온“련정계철출형핵”궤리,발현모사련정변체즉이차련정처병불시우선형핵적위치,저여경전적련생형핵이론적관점불동.
@@@@The effect of twin boundary during static recrystallization of the as-cast AZ31 magnesium alloy annealed at different temperatures for different times was studied after being forged or compressed with certain proportion. The results show that the twins produced by forging are short and their orientations are disordered, but twins produced by compression are narrow and long and exist with groups that have the same orientation. The morphology differences of diverse deformation are related to the difference of deformation rate of the forging and compression. Annealing experiments results show that under the same condition, the recrystallization at twin boundaries of the forged AZ31 magnesium alloy occurs more easily than that of the compressed AZ31 magnesium alloy. Moreover, the nucleation ways in the diverse areas of twin boundary were studied. A new nucleation theory of “twin boundary bulge nucleation mechanism” at low temperature was proposed. The results indicate that some twin variants are not the positions for priority nucleation, which is different from the classic twin nucleation theory.