發(fā)布時(shí)間：2019-01-26 12:11

【摘要】：首先借助文獻(xiàn)中報(bào)道的Zr-Nb合金體系中bcc相的熱力學(xué)參數(shù)計(jì)算了Zr-Nb相圖中處于混溶間隙內(nèi)部的鋯鈮合金發(fā)生調(diào)幅分解的溫度以及成分區(qū)間,然后通過X射線衍射(XRD)、掃描電子顯微鏡(SEM)、透射電子顯微鏡(TEM)等實(shí)驗(yàn)方法對(duì)部分成分的Zr-Nb合金進(jìn)行驗(yàn)證。在實(shí)驗(yàn)過程中,首先不同成分鋯鈮合金均需在β單相區(qū)保溫進(jìn)行固溶處理,得到單一的bcc相,然后在預(yù)測(cè)的調(diào)幅分解溫度下進(jìn)行時(shí)效處理。研究結(jié)果表明,Zr-0.35Nb,Zr-0.4Nb和Zr-0.45Nb合金在不同溫度下保溫時(shí),均在保溫初期發(fā)生了調(diào)幅分解,表明調(diào)幅分解發(fā)生在相變初期;調(diào)幅分解溫度越高,轉(zhuǎn)變發(fā)生越迅速;調(diào)幅分解首先發(fā)生在晶界處,并逐漸向晶內(nèi)轉(zhuǎn)變;得到的組織與預(yù)測(cè)的調(diào)幅分解組織吻合較好。
[Abstract]:Based on the thermodynamic parameters of bcc phase in Zr-Nb alloy system reported in the literature, the temperature and composition range of amplitude modulation decomposition of zirconium and niobium alloy in Zr-Nb phase diagram were calculated. Then the (XRD), was diffracted by X-ray diffraction. Scanning electron microscope (SEM), (SEM), transmission electron microscope (TEM), and other experimental methods were used to verify the partial composition of Zr-Nb alloy. In the process of the experiment, the zirconium and niobium alloys with different compositions need to be heated in the 尾 single phase region for solution treatment, and a single bcc phase is obtained, and then the aging treatment is carried out at the predicted amplitude modulation decomposition temperature. The results show that the amplitude modulation decomposition of Zr-0.35Nb,Zr-0.4Nb and Zr-0.45Nb alloys at different temperatures occurs in the initial stage of heat preservation, indicating that the amplitude modulation decomposition occurs in the initial phase transformation. The higher the amplitude modulation decomposition temperature, the faster the transition occurs; the amplitude modulation decomposition first occurs at the grain boundary and gradually changes to the crystal, and the obtained microstructure is in good agreement with the predicted amplitude modulation decomposition structure.
【作者單位】： 北京科技大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51671025) 國(guó)家科技部重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFB0701401)資助
【分類號(hào)】：TG146.414
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本文編號(hào)：2415466