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FGH98合金的再結晶行為

Recrystallization behaviors of FGH98 alloy

  • 摘要: 利用掃描電鏡和透射電鏡對熱擠壓態和退火態FGH98合金的相析出規律及組織特征進行了分析,并對其再結晶機制進行了深入研究.結果表明:熱擠壓態FGH98合金在空冷過程中已經發生了少量的再結晶現象,隨著擠壓溫度的提高,體系內位錯密度下降.退火態FGH98合金中再結晶機制主要與體系內未回溶的一次γ'相有關,在一次γ'相聚集區再結晶主要以依靠亞晶的聚合和亞晶的長大,或兩者的混合機制進行形核;隨著一次γ'相的減少,合金還可以通過應變誘發晶界遷移、多晶粒交匯區形核、孿晶疊加等多種方式形核.需要指出的是,FGH98合金中未回溶的一次γ'相在退火處理過程中也會通過部分的回復和再結晶發生軟化效應.

     

    Abstract: The precipitated phase behavior, microstructure characteristics and static recrystallization mechanisms of FGH98 alloy in extruding and annealing states were systematically investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A portion of recrystallized grains were observed in as-extruded samples during the cooling process, and the dislocation density decreases with the increasing of deformation temperature. The recrystallization mechanism of FGH98 alloy during the annealing process is mainly dominated by residual primary γ' phase. In the region with a more content of residual primary γ' phase, static recrystallization is controlled by the coalescence and growth of subgrains;when residual primary γ' phase in the alloy decreases, many nucleation mechanisms of static recrystallization may occur, such as strain-induced boundary migration (SIBM), nucleation in the juncture of several grains, and twins superposition nucleation. It must be pointed out that residual primary γ' phase in the alloy can also be softened to somewhat extent by recovery and recrystallization during the annealing process.

     

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