期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
基于原位X射线成像的推进剂损伤演化表征 被引量:5
1
作者 王龙 刘岳勋 +2 位作者 吴圣川 侯传涛 张峰涛 《航空学报》 EI CAS CSCD 北大核心 2023年第7期271-282,共12页
为实现对硝酸酯增塑聚醚(NEPE)固体推进剂的细观损伤及其演化行为的可视化表征,基于自主研制的原位力学试验系统与第3代高分辨同步辐射X射线三维成像技术,对拉伸速率为0.1 mm/s下的NEPE固体推进剂单调拉伸过程进行三维成像原位观测和表... 为实现对硝酸酯增塑聚醚(NEPE)固体推进剂的细观损伤及其演化行为的可视化表征,基于自主研制的原位力学试验系统与第3代高分辨同步辐射X射线三维成像技术,对拉伸速率为0.1 mm/s下的NEPE固体推进剂单调拉伸过程进行三维成像原位观测和表征,获取初始状态固体推进剂的细微观形貌及其随拉伸载荷的演化特征,提取并分析其内部典型损伤的体积与球度随载荷的演化规律。结果表明:同步辐射原位成像技术能够准确获取NEPE固体推进剂的细观结构特征,可以基于灰度差异对固体推进剂的AP颗粒、Al颗粒、基体以及缺陷等实现特征的准确识别。研究发现,NEPE固体推进剂内部缺陷主要有2种,一种为颗粒内的孔洞,一种为AP颗粒/基体界面的初始脱湿。推进剂细观损伤首先表现为初始的界面脱湿形成的孔隙:在拉伸载荷较小时,推进剂的损伤形式主要表现为较大的AP颗粒脱湿形成的孔隙;在拉伸载荷较大时,除AP颗粒脱湿外可以观察到Al颗粒的脱湿,大量的AP颗粒脱湿后形成的孔隙相互融合,最终导致固体推进剂宏观断裂。对固体推进剂内部孔隙定量化表征的结果表明,孔隙体积随着拉伸载荷增大而增加,而球度变化与初始缺陷相关,有初始缺陷时,球度呈现单调减少的趋势,相反则呈现先增加后减少的变化趋势。 展开更多
关键词 同步辐射原位成像 NEPE固体推进剂 界面脱湿 空隙形核 细观损伤演化
原文传递
Recent progress on apparatus development and in situ observation of metal solidification processes via synchrotron radiation X-ray imaging: A review 被引量:3
2
作者 Wen-quan LU Nai-fang ZHANG +2 位作者 Zong-ye DING Qiao-dan HU Jian-guo LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第8期2451-2479,共29页
The solidification process of metals plays a critical role in their final microstructure and, correspondingly, in their performance. It is therefore important to probe the solidification behavior of metals using advan... The solidification process of metals plays a critical role in their final microstructure and, correspondingly, in their performance. It is therefore important to probe the solidification behavior of metals using advanced in situ techniques. Synchrotron radiation X-ray imaging is one of the most powerful techniques to observe the solidification process of metals directly. Here, we review the development of the solidification apparatus, including the directional solidification device, resistance furnace, multi-field coupling device, semisolid forming device, aerodynamic levitation apparatus, and laser additive manufacturing apparatus. We highlight the recent research progress on the use of synchrotron radiation X-ray imaging to reveal the solidification behavior of metals in the above circumstances. The future perspectives of synchrotron radiation X-ray imaging in metal research are discussed. Further development of this technique will contribute to improve the understanding of the solidification process of metals and other types of materials at different scales. 展开更多
关键词 synchrotron radiation imaging in situ observation solidification behavior solidification apparatus METAL
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部