ADVANCE IN Ti_3 Al AND TiAl INTERMETALLICS RESEARCH IN CISRI

ＡＤＶＡＮＣＥＩＮＴｉ_３ＡｌＡＮＤＴｉＡｌＩＮＴＥＲＭＥＴＡＬＬＩＣＳＲＥＳＥＡＲＣＨＩＮＣＩＳＲＩＺＨＯＮＧＺｅｎｇｙｏｎｇ；ＺＯＵＤｕｎｘｕ；ＬＩＳｈｉｑｉｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ，Ｂｅｉ?..     

MARTENSITIC AND R PHASE TRANSFOR MATIONS IN NiTiand NiTiHf

１　ＩＮＴＯＤＵＣＴＩＯＮＳｈａｐｅｍｅｍｏｒｙａｌｌｏｙｓ（ＳＭＡｓ）ａｒｅｅｘｃｅｌｌｅｎｔｃａｎｄｉｄａｔｅｓｆｏｒｃｏｎｔｒｏｌｓｙｓｔｅｍｓａｎｄａｒｅｃｏｍｍｏｎｌｙｒｅｆｅｒｒｅｄｔｏａｓ“ｓｍａｒｔ”ｍａｔｅｒｉａｌｓｄｕｅｔｏｔｈｅｉｒａｂｉｌｉｔｙｔｏｃｈａｎｇｅｓｈａｐｅｗｉｔｈｔｅｍｐｅｒａｔｕｒｅ．Ｔｈｅｓｅａｌｌｏｙｓｃａｎａｌｓｏｇｅｎｅｒａｔｅｓｉｇｎｉｆｉｃａｎｔａｍｏｕｎｔｓｏｆｓｔｒａｉｎ（ａｎｄｓｔｒｅｓｓ）ａｎｄａｒｅｉｄｅａｌｆｏｒｕｓｅｉｎａｃｔ…     

THERMAL ACTIVATION ANALYSIS ON TENSILE DEFORMATION IN Ti47Al2Mn2Nb ALLOY

１　ＩＮＴＲＯＤＵＣＴＩＯＮγＴｉＡｌ／α２Ｔｉ３ＡｌｔｗｏｐｈａｓｅｉｎｔｅｒｍｅｔａｌｌｉｃｓｏｒＴｉＡｌａｌｌｏｙｈａｓｒｅｃｅｎｔｌｙｒｅｃｅｉｖｅｄｉｎｃｒｅａｓｉｎｇａｔｔｅｎｔｉｏｎｂｅｃａｕｓｅｏｆｉｔｓｐｏｔｅｎｔｉａｌａｓａｓｔｒｕｃｔｕｒａｌｍａｔｅｒｉａｌｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅａｐｐｌｉｃａｔｉｏｎｓ,ｗｈｉｃｈａｒｉｓｅｓｆｒｏｍｉｔｓｅｌｅｖａｔｅｄｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｓｔｒｅｎｇｔｈ,ｌｏｗｄｅｎｓｉｔｙａｎｄｇｏｏｄｏｘｉｄａｔｉｏ…     

CONTROLLING HIGHTEMPERATURE DEFORMATION BY VARYING MICROSTRUCTURE IN A Ti47Al2Cr2Nb ALLOY

１　ＩＮＴＲＯＤＵＣＴＩＯＮγＴｉＡｌａｌｌｏｙｓａｒｅａｔｔｒａｃｔｉｖｅｓｔｒｕｃｔｕｒａｌｍａｔｅｒｉａｌｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｐｏｔｅｎｔｉａｌａｐｐｌｉｃａｔｉｏｎｓｉｎａｅｒｏｓｐａｃｅａｎｄａｕｔｏｍｏｂｉｌｅｉｎｄｕｓｔｒｉｅｓ［１］．ＣｕｒｒｅｎｔｒｅｓｅａｒｃｈｏｎγＴｉＡｌｉｓｐｒｉｍａｒｉｌｙｆｏｃｕｓｅｄｏｎｉｍｐｒｏｖｉｎｇｉｔｓｒｏｏｍｔｅｍｐｅｒａｔｕｒｅｄｕｃｔｉｌｉｔｙ,ｔｏｕｇｈｎｅｓｓａｎｄｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｃｒｅｅｐｒｅ…     

FRACTURE MECHANISM IN Ti_3Al Si Nb ALLOYS

ＦＲＡＣＴＵＲＥＭＥＣＨＡＮＩＳＭＩＮＴｉ_３Ａｌ＋Ｓｉ＋ＮｂＡＬＬＯＹＳＷＵＪｉａｎｓｈｅｎｇ；ＺＨＡＮＧＬａｎｔｉｎｇ；ＱＩＵＧｕｏｈｕａ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅ，ＳｈａｎｇｈａｉＪｉａｏＴｏｎｇＵｎｉｖｅｒｓｉ?..     

Ti_3Al PHASE PRECIPITATION DURING VIBRATION FATIGUING FOR A TITANIUM ALLOY

Ｔｉ_３ＡｌＰＨＡＳＥＰＲＥＣＩＰＩＴＡＴＩＯＮＤＵＲＩＮＧＶＩＢＲＡＴＩＯＮＦＡＴＩＧＵＩＮＧＦＯＲＡＴＩＴＡＮＩＵＭＡＬＬＯＹ￥ＴａｏＣｈｕｎｈｕ；ＺｈａｎｇＳｈａｏｑｉｎｇ；ＹａｎＭｉｎｇｇａｏ（ＩｎｓｔｉｔｕｔｅｏｆＡｅｒｏｎａｕｔｉｃａｌＭ?..     

DEFORMATION OF HfVNb LAVES PHASE ALLOYS

１　ＩＮＴＲＯＤＵＣＴＩＯＮＯｎｅｗａｙｔｏｓｅｌｅｃｔｃａｎｄｉｄａｔｅａｌｌｏｙｓｏｆｐｏｓｓｉｂｌｅｉｎｔｅｒｅｓｔｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅａｐｐｌｉｃａｔｉｏｎｓｉｓｔｏｒｅｑｕｉｒｅａｃｏｍｂｉｎａｔｉｏｎｏｆｈｉｇｈｍｅｌｔｉｎｇｔｅｍｐｅｒａｔｕｒｅａｎｄｌｏｗｄｅｎｓｉｔｙ，ａｓｒｅｐｏｒｔｅｄｂｙＦｌｅｉｓｃｈｅｒ［１］．Ｈｅｓｈｏｗｅｄｔｈａｔ，ｉｎｇｅｎｅｒａｌ，Ｌ１２ａｌｌｏｙｓａｒｅｐｒｏｂａｂｌｙｎｏｔｖｅｒｙｇｏｏｄｃａｎｄｉｄａｔｅｓ，ｓｉｎｃｅ…     

THE CALCULATION AND DETERMINATION FOR α_2 PHASE AND α_2/α_2+βPHASE BOUNDARY IN Ti_3AI BASED ALLOYS

对Ｔｉ_３－Ｍｏ－Ｎｂ，Ｔｉ_３Ａｌ－Ｎｂ－Ｖ，Ｔｉ_３Ａｌ－Ｚｒ－Ｖ三个赝三无合金系的实验结果表明，α_２／α_２＋β相界遵守电子浓度规律，且合金元素的价电子数由它们的电子结构决定过渡族元素Ｔｉ，Ｚｒ．Ｖ，Ｍｏ，Ｎｂ的价电子为ｓ＋ｄ电子。即Ｎ_（Ｔｉ）＝Ｎ_（Ｚｒ）＝４（ｓ~２ｄ~２），Ｎ_ｖ＝５（ｓ~２ｄ~３），Ｎ_（Ｎｂ）＝５（ｓ~１ｄ~４），Ｎ_（Ｍｏ）＝６（ｓ~１ｄ~５）、非过渡族元素Ａｌ的价电子为ｓ＋ｐ电子，即Ｎ_（Ａｌ）＝３（ｓ~２ｐ~１）α_２相的计算模型为Ｎ＝ΣＮ_ｉｆ_ｉ，α_２／α_２＋β相界的特征电子浓度值为Ｎ_ｃ＝ΣＮ_ｉｆ_ｉ＝３．７８７．     

EFFECT OF Cr ON MICROSTRUCTURE OF Ti_3Al＋TiAl ALLOYS

研究了Ｔｉ－４４．９Ａｌ（ａｔ．－％）和Ｔｉ－４４．３Ａｌ－３Ｃｒ（ａｔ．－％）合金的铸态组织及其在热处理过程中的变化。结果表明：Ｃｒ增加了Ｔｉ－Ａｌ合金中ＴｉＡｌ（γ）相的含量，促使Ｔｉ３Ａｌ（α２）相由片状变成块状；加速了α２＋γ片状组织的不连续粗化过程，形成了尺寸较小的新生α２＋γ晶。因此，加Ｃｒ和１１５０℃长时热处理是细化α２＋γ两相合金铸态粗晶组织的有效途径；Ｃｒ促进有序体心立方β２相的     

PHASE TRANSFORMATIONS IN Ti-10V-2Fe-3Al NEAR β-ALLOY DURING AGING

The phase transformations in Ti-10V-2Fe-3AI alloy during aging have been studied bymeans of X-ray diffraction and TEM techniques.The morphology and distribution of precipi-tated phases were examined.The lattice parameters of α and β phases as a function of the ag-ing time is obtained,the hardness variation of the specimens related to the aging temperatureand time has been given as well.     

TiAl金属间化合物的熔盐热腐蚀行为

研究了ＴｉＡｌ金属间化合物在熔融盐中的热腐蚀行为。ＴｉＡｌ在９００℃（Ｎａ，Ｋ）２ＳＯ４中呈现良好的抗热腐蚀行为，形成的腐蚀产物具有分层结构，外层为ＴｉＯ２与Ａｌ２Ｏ３的混合氧化物，和二层由致密的Ａｌ２Ｏ３组成，内层是Ｔｉ或Ａｌ的硫化物。在Ｎａ２ＳＯ４＋ＮａＣｌ的混合盐中，ＴｉＡｌ遭受严重的热腐蚀，不能形成保护性的Ａｌ２Ｏ３层，形成的Ａｌ２Ｏ３和ＴｉＯ２混合膜的粘附性差，较易剥落。     

TiAl金属间化合物在熔融碳酸盐中的热腐蚀行为

研究了ＴｉＡｌ金属化合物在熔融碳酸盐中热腐蚀行为,ＴｉＡｌ在６５０℃（Ｌｉ,Ｋ）２ＣＯ３中表现出良好的抗热腐蚀性能,形成的主 物主要由ＬｉＡｌ和Ｌｉ２ＴＩＯ３组成,其下层是ＴｉＯ２和Ａｌ２Ｏ３,在７５０℃时腐蚀产物中Ｌｉ２ＴｉＯ３的熔化导致明显减重。     

两种不同涂层的Ti纤维增强TiAl基复合材料

研究了涂覆单一涂层Ｙ２Ｏ３或Ａｌ２Ｏ３的Ｔｉ纤维增强γＴｉＡｌ基复合材料的界面和性能。动用物理气相沉只法在Ｔｉ比例有面涂覆Ｙ２Ｏ３或Ａｌ２Ｏ３涂层后，然后用类似箔叠法制得了Ｔｉ－Ｙ２Ｏ３／γＴｉＡｌ和Ｔｉ－Ａｌ２Ｏ３／γ－ＴｉＡｌ复合材料，复合材料的弯曲强度从４４９ＭＰａ提高到５６２ＭＰａ（Ｔｉ－Ｙ２Ｏ３／γ－ＴｉＡｌ）或５７３ＭＰａ（Ｔｉ－Ａｌ２Ｏ３／γＴｉＡｌ）而且高于纯Ｔｉ纤维增强了ＴｉＡｌ     

A COMPONENT-SPECIFIC ALLOY DESIGN OF TiAl INTERMETALLICS

ＡＣＯＭＰＯＮＥＮＴ－ＳＰＥＣＩＦＩＣＡＬＬＯＹＤＥＳＩＧＮＯＦＴｉＡｌＩＮＴＥＲＭＥＴＡＬＬＩＣＳＪ．Ｚｈａｎｇ;Ｄ．Ｘ．Ｚｏｕ;Ｚ．Ｚ．ＺｈａｎｇａｎｄＺ．ＹＺｈｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎ＆ＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ,Ｂｅｉ...     

PHASE TRANSFORMATION INDUCED BY DEFORMATION IN TiAl(Cr) INTERMETALLICS AT ROOM TEMPERATURE

１　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｆｉｅｌｄｏｆｐｈａｓｅｔｒａｎｓｆｏｒｍａｔｉｏｎｉｎｄｕｃｅｄｂｙｄｅｆｏｒｍａｔｉｏｎａｔｒｏｏｍｔｅｍｐｅｒａｔｕｒｅｉｓａｃｈａｌｌｅｎｇｉｎｇｒｅｓｅａｒｃｈｔｏｐｉｃｉｎＴｉＡｌｉｎｔｅｒｍｅｔａｌｌｉｃｓ．Ｔｈｉｓｉｄｅａｗａｓｆｉｒｓｔｐｒｏｐｏｓｅｄｔｏｅｘｐｌａｉｎｏｎｅｏｆｔｈｅｓｔａｇｅｓｏｆｓｔｒａｉｎｓｔｒｅｓｓｃｕｒｖｅｉｎｔｈｅｄｅｆｏｒｍａｔｉｏｎｅｘｐｅｒｉｍｅｎｔｓａｔｒｏｏｍｔｅｍｐｅｒａｔｕｒｅ［１］．Ｈｏｗｅｖｅ…     

DOUBLE GLOW PLASMA SURFACE ALLOYING OF Ti6Al4V AND TiAl

In order to improve the wear resistance of titanium alloy Ti6Al4 V and high temper-ature oxidation resistance of intermetallic compound TiAl, the Double Glow PlasmaSurface Alloying Technique (DG technique) was applied to modify the surface proper-ties ofthese materials. Mo, Nb, Cr, Ni were diffused into the substrate materials toform alloyed layers with different properties. This paper shows the microstructures,microhardnesses, distributions of the alloy elements of the alloyed layers. Wear andhigh temperature oxidation tests were carried out. The test results indicate that thewear resistance of Ti6Al4 V and the high temperature oxidation resistance of TiAl wereimproved significantly.     

TiAl金属间化合物碳元素激光表面合金化

利用元素碳对ＴｉＡｌ金属间化合物化合金进行激光表面合金化,制得了以硬质ＴｉＣ为增强相的新型快速凝固“原位”复合材料表面改性层,研究了激光表面合金化工艺参数对激光表面改性显微组织的影响。     

TiAl/Al的连接及Ti/TiA/Al系梯度材料的制备

1473K,30MPa,1h的热压条件下烧结了Ti／Ti TiAl／TiAl粉体叠层材料,在烧结过程中,混合层Ti＋TiAl内部发生了剧烈的化学反应（Ti＋TiAl→AlTi2）,该反应波及到相邻的Ti层及TiAl层,因而形成了物相组成渐变的精细梯度结构：Ti／Ti＋AlTi2／AlTi2／AlTi2＋TiAl／TiAl．使用A176Si10Zn10Cu4质量分数,％）合金钎料在853K,20min的钎焊条件下将该材料的TiAl例与Al进行了连接界面的测试表明,钎焊过程中钎料中的元素Si向TiAl表面扩散,并有Ti-Si化合物生成对反应机理进行了探讨．最终获得的Ti／TiAl／Al系密度梯度材料不仅整体致密,而且其密度治厚度准连续变化     

MCrAlY涂层对TiAl金属间化合物抗高温氧化性能的影响

研究了溅射Ｃｏ－３０Ｃｒ－６Ａｌ－０．５Ｙ及Ｎｉ－３０Ｃｒ－６Ａｌ－０．５Ｙ涂层对ＴｉＡｌ金属间化合物抗高温氧化性能的影响。结果表明，在９００℃－１０００℃范围内，ＣｏＣｒＡｌＹ，ＮｉＣｒＡｌＹ涂层表面由于可形成粘附性良好的Ａｌ２Ｏ３膜。大大改善了ＴｉＡｌ金属间化合物的抗氧化性能。