It is mainly because that dislocation slides easily within large twincrystal, which leads to the decrease of strength and the increase in plasticity.
主要是位错在大孪晶中易于移动,从而造成强度下降,塑性提高。
2
At the time of deformation reached 40%, the appearance of the crystal changed greatly: the size refined, boundary turned clear, second phase disappeared and twincrystal structure appeared.