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研究了Mg-9Gd-4Y-0.4Zr高强耐热镁合金在热轧及随后静态退火过程中的微结构与织构的演变,以此来确定静态再结晶对轧制织构的影响及其机制。采用金相显微术、扫描电子显微术、透射电子显微术及EBSD分析技术表征了试样在不同下压量和随后退火过程中的微结构及织构改变。织构测试的结果表明,单向热轧变形产生了六方晶格c轴偏离理想基面织构15°的新织构组分;随后的再结晶过程导致新织构组分趋于漫散化并加强了基面织构。显示晶内和晶界上大量析出的沉淀相显著抑制了晶界迁移;静态再结晶对织构的影响是由定向形核控制的,而不是定向长大。
The microstructure and texture evolution of Mg-9Gd-4Y-0.4Zr high-strength heat-resistant magnesium alloy during hot rolling and subsequent static annealing were studied to determine the effect of static recrystallization on the rolling texture and its mechanism . The microstructure and texture changes of the specimens during different reduction and subsequent annealing were characterized by metallographic microscopy, scanning electron microscopy, transmission electron microscopy and EBSD analysis. The texture test results show that the unidirectional hot rolling deformation produces a new textured component with a c-axis of the hexagonal lattice deviating 15 ° from the ideal basal texture; subsequent recrystallization causes the new textured component to become diffusive And strengthen the basal texture. It is shown that a large amount of precipitated phases precipitated on the grain boundaries and grain boundaries significantly inhibit the grain boundary migration. The effect of static recrystallization on the texture is controlled by directional nucleation instead of oriented growth.