试样在超塑性变形时产生的伸长率与晶界宽度有密切联系。
Elongation of the sample during superplastic deformation has a close relation with grain boundary width.
晶粒长大到微米尺度时，变形机制主要是位错协调的晶界滑移和位错滑移塑性。
The main deformation mechanisms are dislocation accommodated grain boundary sliding and dislocation slip plasticity when the grains grow to micro size.
变形量为40%时，轧板的晶粒形貌发生了显著变化，晶粒变得细小，晶界清晰，第二相完全消失，并出现孪晶组织。
At the time of deformation reached 40%, the appearance of the crystal changed greatly: the size refined, boundary turned clear, second phase disappeared and twin crystal structure appeared.
拉伸载荷与孪晶界不垂直时，屈服应力降低，变形方式则以去孪晶为主。
When the tensile load is not perpendicular to the twin boundary, the yield stress decreases and the deformation is mainly detwinning.
当冷变形率在20%左右时，出现变形孪晶，使得合金强度有大幅度提高。
During cold drawing, the alloy exhibited excellent workability. Deformation twins appeared when the reduction of cold deformation was around 20%.
当冷变形率在20%左右时，出现变形孪晶，使得合金强度有大幅度提高。
During cold drawing, the alloy exhibited excellent workability. Deformation twins appeared when the reduction of cold deformation was around 20%.
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