共搜索到38919条信息,每页显示10条信息,共3892页。用时:0小时0分0秒281毫秒
Growth and optical properties of Pr3+:La2CaB10O19 crystal祖延雷1,2,张建秀1,傅佩珍1,吴以成11. Beijing Center for Crystal Research and Development,Key Laboratory of Functional Crystals and Laser Technology,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences2. Graduate School of the Chinese Academy of Sciences摘 要:Pr3+ doped La2CaB10O19 crystal......
"><正> The {0001} face develops on the habit of self-frequency doubling laser crystal Yb: YAI3(B03)4 (YbYAB) only under high growth rate condition, and its morphology is rough. To study the growth... on the {0001} polishing section reflect the crystal growth process. It is shown that the growth morphology on the {0001} polishing section was rough with many hillocks at the first growth stage, and it can......
direction (vertical cold-board direction). Final, the results of initial β-Ti crystal growth simulation basically conform to the actual additive manufacturing. Key words: CAFE; alloy wire; arc; additive manufacturing; Ti6Al4V; crystal growth Foundation item: Project(2017080CG/RC043) supported by the Plan for Supporting Science and Technology of Xi’an, China Received date: 2017-08-24; Accepted date......
包晶反应产物侧向生长速度的研究常国威1,金光灿1,陈淑英1,李青春1,岳旭东1(1.辽宁省锦州市辽宁工业大学材料科学与工程学院)摘 要:针对Fe-C合金包晶反应过程中,γ相沿L/δ界面侧向生长速度的实测值远远大于Bosze和Trivedi模型的计算值的问题,分析了包晶反应过程中固/液界面前沿溶质浓度分布状况,得到了金属熔体中圆柱形固相生长时固/液界面前沿溶质浓度分布表达式.以Jackson提出的熔体中粗糙界面生长速度公式为基础,确定了适合计算合金包晶反应产物侧向生长速度的公式,并将其应用于Fe-C和Fe-Ni合......
, and the other is the formation manner of oxide in the initial stage. In the beginning, the growth of the oxide is along crystal lattice of matrix alloy, called false crystalline oxide, so that the growth... Growth process and corrosion resistance of micro-arc oxidation coating on Mg-Zn-Gd magnesium alloys WANG Ping(王 萍)1, 2, LIU Dao-xin(刘道新)1, LI Jian-ping(李建平)2, GUO Yong-chun(郭永春)2, YANG Zhong(杨 忠......
Crystal Growth and Properties of Co2+ doped Y3Sc2Ga3O12 Single Crystal郭世义,袁多荣,石绪忠,程秀凤,张希清,于法鹏摘 要:Single crystal of cobalt (Co)-doped Y3Sc2Ga3O12 (YSGG) with the dimensions up to Φ20×40 mm3 and undoped YSGG crystal with the dimensions up to Φ28×60 mm3 have been grown using the Czochralski technique. The structure of the crystal was characterized by the X......
crack growth rate; crystal orientation 钛合金具有高比强度,高比刚度及高韧性等优点,因此大量应用到飞机机体,结构体和发动机零件等领域.TC4合金是目前应用最广泛的钛合金之一.由于钛合金材料成本高,且通过机械加工,锻造和焊接等方法加工比较困难,在一定程度上限制其进一步推广应用.采用精密铸造技术则可以提高钛合金材料的利用率,降低成本[1].目前,大型,薄壁,整体精密钛合金...: Fatigue crack growth rates testings were carried out on as-cast TC4 thin wall structure component before and after hot isostatic pressing (HIP). The microstructure, fatigue fracture......
恒位移下BaTiO3单晶在空气中亚临界裂纹扩展与畴变赵显武1,褚武扬2,乔利杰2(1.北京市北京大学力学与空天技术系2.北京科技大学 腐蚀与防护中心)摘 要:用正交偏振光显微镜,通过原位观察研究了恒位移下BaTiO3单晶贯穿裂纹快速扩展与畴变的关系,以及在室温空气中(湿度为35%RH)亚临界裂纹扩展和畴变的关系.结果显示,加载开始时首先出现畴变,且其体积分数随载荷升高而增大;当载荷达到临界值时,裂纹快速形核,扩展并止裂,在空气中保持恒位移,畴变能慢慢发生,即空气中水吸附能促进畴变,当畴变发展到临界条件时就引起裂......
and RE+Sr composite additions on the crystal growth and phase precipitation in AZ91D magnesium alloy were studied and the mechanism was analyzed. 2 Experimental The experimental alloys were prepared... predominance. Because of this, the preferred growth manner of the primary crystal is depressed and α-Mg dendrites are blunted by RE or Sr or RE+Sr composite additions, as shown in Fig.3. 3.2 Morphology......
Study on Growth and Spectra Properties of Nd: GGG Crystal Liu Jinghe1,Sun Jing1,Zhang Ying1,Zeng Fanming1 (1.School of Materials Science, Changchun University of Science and Technology, Changchun 130022, China) Abstract:The laser crystal Nd: GGG was grown by Cz method. The optimum processing parameter is that the pulling rate is 2~4mm·h-1, the rotation rate is 20~40 r·min-1 and the cooling......