本文關鍵詞：鈰γ→α相變的室溫動態(tài)特性　出處：《爆炸與沖擊》2017年03期 　論文類型：期刊論文

  更多相關文章： 鈰 相變 靜水壓 相變模型

【摘要】：通過試樣組件尺寸匹配設計的被動圍壓SHPB實驗,獲得了99.8%純鈰在1.7GPa靜水壓內的、包含γ?α相變和逆相變過渡區(qū)的室溫動態(tài)靜水壓-體應變連續(xù)曲線。研究顯示:室溫鈰γ→α相變是具有明顯滯后現(xiàn)象的一級相變,而非以往研究認為的體積躍變的一級相變;相變過渡區(qū)的靜水壓范圍是0.8~1.3GPa。逆相變過渡區(qū)的靜水壓范圍是0.6~1.1GPa;逆相變過渡區(qū)的靜水壓-體應變曲線滯后于相變過渡區(qū)的靜水壓-體應變曲線0.15GPa靜水壓;在相變和逆相變過渡區(qū)內,靜水壓-體應變曲線按照約4.2GPa體積模量的線性關系演化;演化機制為γ和α兩相均勻混合、靜水壓驅動兩相組份轉化�；谠撗莼瘷C制,構建了描述相變前后和相變過程的靜水壓-體應變響應的三段線性模型。
[Abstract]:Based on the passive confining pressure (SHPB) experiment designed for sample assembly size matching, 99.8% pure cerium was obtained in 1.7GPa hydrostatic pressure, containing 緯? The dynamic hydrostatic pressure-bulk strain continuum curves at room temperature in the transition region of 偽 -phase transition and inverse phase transition are obtained. The results show that cerium 緯 at room temperature. 鈫扵he 偽 phase transition is a first order phase transition with obvious hysteresis, rather than the first order phase transition with volume jump as previously considered. The hydrostatic pressure range of phase change transition zone is 0.81.3GPa.The hydrostatic pressure range of inverse transition zone is 0.61.1GPa. The hydrostatic pressure-volume strain curve of the inverse phase transition region lags behind that of the hydrostatic pressure volume strain curve of 0.15 GPA in the transition zone. In the transition region of phase transition and inverse phase transition, the hydrostatic pressure-volume strain curve evolves according to the linear relationship of volume modulus of about 4.2 GPA. The evolution mechanism is the homogeneous mixing of 緯 and 偽 phases, and the hydrostatic pressure drives the two-phase transformation. Based on the evolution mechanism, a three-stage linear model describing the hydrostatic pressure-body strain response before and after the phase transition and the phase transition process is constructed.
【作者單位】： 中國工程物理研究院流體物理研究所沖擊波物理與爆轟物理重點實驗室;
【分類號】：O341
【正文快照】： 鈰是地球上含量最豐富、價格最便宜的稀土元素,被廣泛應用于玻璃和搪瓷的脫色劑、玻璃拋光粉、燃料減排的添加劑、打火石等用途[1]。在物理和力學性能方面,鈰最吸引研究者關注的是靜水壓控制的、一階同構的γ→α相變。其室溫下的力學表現(xiàn)是:隨著靜水壓的增加,單一γ相材料在0，

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