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采用电子背散射衍射(EBSD)技术研究了经室温多向锻造(真应变ε=4)和310℃再结晶退火1 h的Pb-0.07Ca-1.8Sn-0.026Al(质量分数,%)合金在轧制及退火过程中形成Σ3晶界的条件。结果表明:经厚度减缩量为90%室温大变形轧制并经270℃中间退火的试样,能够在后续轧制和退火过程中形成占总晶界比例超过47%的Σ3晶界;相反,未经室温大变形轧制和中间退火,而直接进行30%冷轧变形轧制和退火的试样,其Σ3晶界的比例不超过18%。分析认为:样品经大变形轧制和中间退火所形成的{011}<100>(Goss)、{110}<112>(B或Brass)、{001}<100>(Cube)和{112}<111>(Copper)等织构组合是Pb-0.07Ca-1.8Sn-0.026Al合金在后续轧制和退火过程中形成大量Σ3晶界的重要条件。
Pb-0.07Ca-1.8Sn-0.026Al (mass fraction,%) alloy was investigated by electron backscatter diffraction (EBSD) technique at room temperature forging (true strain ε = 4) and recrystallization annealing at 310 ℃ Conditions for forming Σ3 grain boundaries during rolling and annealing. The results show that the samples with large deformation and rolling at room temperature of 90% and intermediate annealing at 270 ℃ can form Σ3 grain boundaries that account for more than 47% of the total grain boundaries in the subsequent rolling and annealing processes. , Without large deformation at room temperature rolling and intermediate annealing, and direct cold deformation of 30% rolled and annealed samples, the proportion of Σ3 grain boundaries does not exceed 18%. The analysis shows that the samples are {011} <100> (Goss), {110} <112> (B or Brass), {001} <100> (Cube) and {112} formed by large deformation and intermediate annealing. The texture combination of <111> (Copper) is an important condition for the formation of a large number of Σ3 grain boundaries in the subsequent rolling and annealing of Pb-0.07Ca-1.8Sn-0.026Al alloy.