CAJ | 학술논문

本文利用原位EBSD技术研究了多晶纯钛在拉伸变形过程中的孪生变形行为。在0％～7?1％变形阶段，形成的孪晶为｛1122｝一次孪晶，当变形增加至16?4％时，在｛1122｝一次孪晶内形成｛1012｝二次孪晶。通过计算应力方向与晶体C轴夹角，判断出容易出现｛1122｝压缩孪晶和｛1012｝拉伸孪晶，理论计算得到的结果与实验结果一致。孪晶的形核位置为与周围相邻晶粒取向差最大的晶界处，即高角度晶界处，这为多晶材料的塑性变形模拟提供了实验参考。
본문이용원위EBSD기술연구료다정순태재랍신변형과정중적련생변형행위。재0％～7?1％변형계단，형성적련정위｛1122｝일차련정，당변형증가지16?4％시，재｛1122｝일차련정내형성｛1012｝이차련정。통과계산응력방향여정체C축협각，판단출용역출현｛1122｝압축련정화｛1012｝랍신련정，이론계산득도적결과여실험결과일치。련정적형핵위치위여주위상린정립취향차최대적정계처，즉고각도정계처，저위다정재료적소성변형모의제공료실험삼고。
The twinning deformation behaviors of polycrystal pure titanium were studied by in situ EBSD technique. The results show that the primary twin formed during 0% ~7% strain is{1122} compressive twin, while the secondary{1012} tensile twin forms when the strain increases to 16?4%. The geometry angle between the loading direction and c?axis of crystal indicates that {1122}compressive twin and {1012} tensile twin are easier to form. The theoretical calculation is in well consistent with the experimental results. The nucleation site of twin is located in a grain boundary with highest misorientation comparing with the other boundaries, i. e. , high angle boundary. The results provide experimental insight into modeling of plastic deformation in HCP structured polycrystalline metals.