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[求助] primary mechanical twins问题

文献上看到这样一句话,Both primary mechanical twins (TW1) (Fig. 6b) and secondary mechanical twins (TW2), which exhibited a different variant from that of the TW1, were observed at a true strain of 0.05 (Fig. 6c).The interior angle between the primary and secondary mechanicaltwin directions was measured by TEM to be 69, which was in good agreement with the calculated angle of 70 between the ½111 and ½111 directions.
那问题来了,  primary mechanical twins是初次变形孪晶的意思么? secondary mechanical twins是二次变形孪晶的意思么?初次变形孪晶和二次孪晶都是怎么回事呀?初次孪晶和二次孪晶间的角度一定是在70度左右吗?
我在孪晶里又看到孪晶了,这两个孪晶间的夹角并不是70度,大约为60度左右,那可以说这两个孪晶是初次孪晶和二次孪晶的关系么?
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