循环热处理细化铸造 Ti-46Al-8.5 Nb-0.2W 合金的工艺及机理

对循环热处理细化铸造Ｔｉ－４６Ａｌ－８．５Ｎｂ－０．２Ｗ合金工艺及机理进行了研究。循环热处理可使铸造Ｔｉ－４６Ａｌ－８．５Ｎｂ－０．２Ｗ合金粗大的层片组织转变均匀细小的等轴近γ（ＮＧ）组织。在循环热处理中,层片通过γ相溶解←→析出相变和Ｒａｙｌｅｉｇｈ扰动产生缩颈和间断,缩颈和间断的γ片形成高密度分布的层片边缘,在略低于共析温度退火时,发生由表面张力驱动的等轴化,得到晶粒尺寸不太均匀的ＮＧ组织。在     

Ti－5Al－2．5Fe合金热处理制度与显微组织的研究

Ｔｉ－５Ａｌ－２．５Ｆｅ合金热处理制度与显微组织的研究王永兰，王桂生（北京有色金属研究总院１０００８８）关键词：钛合金，显微组织外科植入物的金属材料主要有不锈钢，钴基合金，工业纯钛及Ｔｉ－６Ａｌ－４Ｖ合金［１］。近十年来，德国发展起来的Ｔｉ－５Ａｌ－...     

显微组织对TiAl基合金室温断裂韧性的影响

研究了相同晶粒尺寸的不同类型显微组织，以及全层片状组织的晶粒尺寸等因素对Ｔｉ－３３Ａｌ－３Ｃｒ－０．５Ｍｏ（×１００~（－２））合金的室温断裂韧性的影响，结果表明：在晶粒尺寸相当的条件下，随着显微组织中层片状晶团的体积百分数及尺寸的增大，ＴｉＡｌ基合金的室温断裂韧性提高。使用扫描电子显微镜观察了不同显微组织试样的裂纹扩展动态过程。     

Ti－24Al－14Nb－3V－0．5Mo合金拉伸变形显微组织的研究

用透射电子显微镜研究了Ｔｉ３Ａｌ－Ｎｂ（Ｔｉ－２４Ａｌ－１４Ｎｂ－３Ｖ－０．５Ｍｏ）合金拉伸变形显微组织，利用双倾技术和双束条件下不可见判据，分析了合金中具有ＤＯ１９结构的α２相在拉伸过程中的变形机制。     

Ti—241Al—14Nb—3V—0.5Mo合金拉伸变形显微组织的研究

用透射电子显微镜研究了Ｔｉ３Ａｌ－Ｎｂ（Ｔｉ－２４Ａｌ－１４Ｎｂ－３Ｖ－０．５Ｍｏ）合金拉伸变形显微组织，利用双倾技术和双束条件下ｇ．ｂ＝０不可见判据，分析了合金中具有Ｄ０１９结构的α２相在拉伸过程中的变形机制。     

TiAl基合金显微组织与室温断裂韧性关系的研究

分别测试了具有不同显微组织的Ｔｉ３３Ａｌ３Ｃｒ０．５Ｍｏ（ｗｔ％）合金的室温断裂韧性，发现在晶粒尺寸相当的条件下，全层片组织合金试样的断裂韧性最高，双态组织最低。这主要归因于全层片组织能够较好地调节应变不协调性，从而使断裂应变提高，塑性区扩大     

热机械处理对Ti3Al基合金板条组织形貌及室温拉伸性能的影响

研究了热机械处理（ＴＭＰ）对Ｔｉ３Ａｌ基合金Ｔｉ－２４Ａｌ－１４Ｎｂ－３Ｖ（原子分数％）板条组织的形貌及室温拉伸性能的影响，通过ＴＭＰ可获得各种各样的板条组织。Ｔｉ－２４Ａｌ－１４Ｎｂ－３Ｖ板条组织的最高断裂强度可达１２２５ＭＰａ，最大伸长率达８．５％，对板条形貌与室温拉伸性能的关系进行了分析，用ＳＥＭ观察了室温拉伸过程中的裂纹扩展情况，经ＴＥＭ观察发现，在缓冷样品中板用周边存在着一种α２＋Ｏ相的     

钛纤维强化Ti－48Al－2Cr－2Nb合金复合材料性能与界面研究

用物理气相沉积法在钛纤维表面蒸镀一层厚约２．５μｍ的Ｙ２Ｏ３涂层，用真空热压工艺制备钛纤维强化Ｔｉ－４８Ａｌ－２Ｃｒ－２Ｎｂ钛铝化合物基复合材料。对该复合材料的力学性能、界面、组织进行了研究。结果表明：钛纤维强化Ｔｉ－４８Ａｌ－２Ｃｒ－２Ｎｂ合金复合材料的弯曲强度较基体Ｔｉ－４８Ａｌ－２Ｃｒ－２Ｎｂ合金提高了１５％，但弯曲挠度和弹性模量变化不大。靠近界面基体组织出现片层化倾向，纤维损耗严重，其界面反应厚度约２０μｍ。     

添加钙对铸态Ti－Al基合金性能的影响

研究了添加钙对Ｔｉ－３４Ａｌ合金显微组织和室温力学性能的影响。结果表明，添加少量钙可使Ｔｉ－Ａｌ合金的室温强度和延性显著提高，显微组织由粗大的柱状晶向树枝晶转变。断口形貌分析表明，含钙的Ｔｉ－Ａｌ三元合金断裂除表现垂直于层片方向的解理断裂外，在γ单相中出现了河流花样，断口上有较多的撕裂棱     

一种新型钛合金的超塑性

本文研究了Ｔｉ－５Ａｌ－８Ｎｉ和Ｔｉ－５Ａｌ－８Ｃｏ合金低温应变速率下的超塑性性能和超塑性加工后组织形貌。     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

正~~     

Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

正~~