γ—TiAl基合金块状组织中孪晶与反相畴界的相互作用

Interaction between the Twins and the Anti-Phase Boundaries in Massive Transformation for

摘要:

研究了Ti-47Al-2Nb-1Mn块状组织中孪晶与反相畴界相互作用的3种形式。结果表明：当孪晶与反相畴界相交或反相畴界终止在孪晶上时，孪晶通常较厚；而当二者相互终止在彼此末端时，孪晶通常较薄；在两者相互终止之前，孪晶通常存在一个由厚到薄的过程。由此证明，在块状转变发生的过程中，孪晶与反相畴界之间必然存在着某种密切的联系，使其产生上述3种作用形式。

Abstract:

Three kinds of interactions between the twins and the anti phase boundaries(APBs) have been studied in massive transformation for Ti 47Al 2Nb 1Mn alloys. The results show that: the twins are usually thicker when the twins intersect with the APBs or the APBs are terminated with the twins; and the twins usually thinner when the twins are terminated with the APBs on the ends.In the late case, the twin has a wedge shape and ended at the APB with a sharp tip. Thus, we can conclude that in the course of the massive transformation there must be some close relations between the twins and the APBs which lead to the three kinds of interactions mentioned above.