搜索结果: 16-30 共查到“知识库 黑色金属及其合金”相关记录272条 . 查询时间(1.672 秒)
采用毛细管微电极测试方法、扫描Kelvin探针技术和数值分析方法,对2024-T351高强铝合金裂纹尖端在3.5NaCl溶液中的微区电化学特性和腐蚀行为进行了研究. 结果表明, 裂纹尖端的腐蚀电位较远离裂纹尖端的基体位置更负, 裂纹尖端处的电化学活性明显增加. 在外加应力的作用下,裂纹尖端处表面氧化膜的厚度减薄, 其稳定性和保护性变弱. 裂纹尖端处优先发生阳极溶解, 浸泡24 h后在裂纹尖端处出现...
时效对7055铝合金厚板淬透性的影响
7055铝合金厚板 淬透性 时效
2013/11/26
采用末端淬火实验、光学显微镜、扫描电子显微镜、透射电子显微镜和差示扫描量热法, 研究了时效制度对7055铝合金厚板淬透性的影响. 结果表明: 人工时效前进行长时间的自然时效可提高板材的淬透性, 自然时效和人工时效的淬透深度分别约为78和45 mm, 而自然+人工时效的淬透层深度可达100 mm. 冷却速率减小时, 析出了粗大的$\eta$平衡相, 溶质和空位浓度降低, 时效后的 η'沉淀强化相数量...
采用SEM背散射电子(BSE)技术以及能谱(EDS)等手段定量研究了加热温度和保温时间对AA3104铝合金中(Fe, Mn)Al6相向α-Al12(Fe, Mn)3Si相转变作用规律, 通过连续截面方法对600 ℃保温条件下不同阶段的共晶相(即 (Fe, Mn)Al6相及α-Al12(Fe, Mn)3Si相)形貌进行三维重构, 从三维角度揭示了转化各阶段共晶相的三维形态. 对转变过程中标志性的铝点...
采用还原扩散方法制备了NiMnGaSi合金粉末, 并粘结成磁体. 磁测量表明粘结磁体的马氏体相变开始温度MS为308 K, 居里温度TC为358 K. 磁致应变测量发现粘结NiMnGaSi磁体在300 K、0.7 T的磁场下具有0.56%大磁致应变.
钛合金超高周疲劳性能试验研究
钛合金 超高周疲劳 p-S-N曲线 裂纹扩展寿命
2013/9/27
采用ANSYS软件进行模态分析和谐响应分析,确定钛合金(TC17)试样尺寸和试验加载频率。利用弯曲疲劳试验系统进行试样在室温20kHz条件下的超高周疲劳试验。通过分析试验数据,计算得到p-S-N曲线,发现在大于107循环时,试样不存在传统意义上的疲劳极限。运用Paris模型从理论上计算得到钛合金(TC17)试样裂纹扩展寿命,发现其不超过中值疲劳寿命的2.1%。
新型Al-Zn-Mg-Cu合金双级时效制度研究
Al-Zn-Mg-Cu合金 双级时效 显微组织 性能 沉淀相
2013/9/29
采用硬度法测定了一种新型AlZnMgCu合金挤压带板的GP区临界形核温度TV（GP区在此温度下形核不依靠空位浓度）和TC（GP区在此温度以上不能形核）。他们的温度区间分别为130~140℃和170~180℃。依据实验结果确定了合金的一级时效温度为120℃，二级时效温度为165℃。合金在120℃/4h+165℃/8h制度下热处理后，L向的抗拉强度、屈服强度、伸长率、断裂韧度和电导率分别为617...
Characterization of Bi and Fe co-doped PZT capacitors for FeRAM
Characterization Bi Fe co-doped PZT capacitors FeRAM
2010/10/12
Ferroelectric random access memory (FeRAM) has been in mass production for over 15 years. Higher polarization ferroelectric materials are needed for future devices which can operate above about 100 °C...
Artificial intelligence-based control system for the analysis of metal casting properties
Artificial intelligence-based system the analysis metal casting properties
2010/8/12
Based on the current demands in the metal casting industry for advanced and “intelligent” computing architectures, the present research focuses on the implementation of an Artificial Intelligence-Base...
A study on the CO2 laser welding characteristics of high strength steel up to 1500MPa for automotive application
A study CO2 laser welding characteristics high strength 1500MPa automotive application
2010/8/12
The automotive industry is continuously striving to develop light weight vehicles to address global warming. For light weight vehicles, the focus on materials is shifting increasingly from conventiona...
Physicochemical properties of Cr-Ni-Mo steel and Co-Cr-W-Ni alloy applied in urology
Physicochemical Cr-Ni-Mo steel Co-Cr-W-Ni alloy urology
2010/8/12
Dynamic development of urinary system diseases treatment methods brought about a variety of choices related to diagnostics or treatment for each individual case. At present it is estimated that urolog...
The microstructure and properties of the bainitic cast steel for scissors crossovers
The microstructure and properties of the bainitic cast steel for scissors crossovers
2010/8/12
On 23.07.1996 the European Parliament and the Council issued a Decision No 1692/96 to upgrade the trans-European conventional rail network to be equipped for speeds up to 200 km/h with an axle load no...
Influence of continuous casting conditions on grey cast iron structure
Casting Cast iron Graphite Electromagnetic field
2010/8/17
Forced convection of liquid metal in the traditional mould or in the continuous casting mould has a significant influence on the crystallization process of castings. For many years, the device whose m...
Microstructure evolution in CRCS processed strips of CuCr0,6 alloy
Microstructure evolution CRCS strips
2010/8/12
Several different methods have been proposed to produce ultra fine grained (UFG) or nano-structured (NS) materials by imposing severe plastic deformation (SPD). Semi products produced by SPD are of gr...
Influence of cold rolling on the corrosion resistance of austenitic steel
cold rolling corrosion resistance austenitic steel
2010/8/12
The existing demand for materials with high functional properties, a definite geometrical shape, a high resistance to the destructive effect of a aggressive environments, produced in
compliances with...
Microstructures of Mg-Al-Zn and Al-Si-Cu cast alloys
Microstructures Mg-Al-Zn Al-Si-Cu cast alloys
2010/8/11
Recent years’ dynamic development, being present in the automobile industry, is mostly based on innovative constructional solutions as well modern materials, which directly influence mass, performance...