轧制Fe_(81)Ga_(19)合金薄带再结晶织构演变

Recrystallization Texture Evolution in Rolled Fe_(81)Ga_(19) Alloy Thin Sheet

对Fe_(81)Ga_(19)合金进行冷轧与再结晶退火,考察了压下率对再结晶织构及磁致伸缩性能的影响.再结晶织构主要由Goss({110}<001>)和γ(<111>//ND)织构组成,再结晶织构特征随压下率增加出现明显的改变,归因于变形微结构与冷轧织构的差异.冷轧压下率从60%增加到70%时,剪切带密度增加且{111}<112>形变织构增强,提高再结晶Goss织构强度与磁致伸缩性能.压下率为80%时,剪切带与形变基体取向变化使剪切带晶核取向漫散,且晶界储能提高为再结晶γ织构提供更多形核位置,导致再结晶Goss织构减弱而γ织构增强,降低薄带磁致伸缩性能.

The texture evolution and the magnetostriction response of the recrystallized Fe81 Ga19 alloy thin sheet cold rolled with different reductions were investigated. It is revealed that the recrystallization texture is composed of Goss( { 110} < 001 >) and γ( < 111 >//ND) texture,the characteristic of recrystallization texture is affected greatly by the reduction,attributed to the variation of deformed microstructure and texture. As the cold rolled reduction increases from 60%to 70%,Goss texture and magnetostriction value are enhanced by the increasing shear bands and strong { 111} < 112 > texture in deformed matrix. However,when the reduction is 80%,the Goss texture becomes weakened and the γ texture has been enhanced,resulted in a lower magnetostriction,because of the orientation deviation of nucleated grains in shear band caused by the texture variation in deformed matrix and shear bands,as well as more nuclear sites for recrystallized γ grains supplied by grain boundary with a higher storage energy.