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EFFECT OF Zr ON DUCTILITY OF CAST Ni_3 Al-BASE ALLOYS

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Acta metallurgica sinica(English Letters) 1992年第6期5卷 409-413页

作者： ZHENG Zhi WU Weiwen guo jianting ZHU Yaoxiao institute of metal research,academia sinica,shenyang,china institute of metal research,academia sinica,shenyang 110015,china Inst of metal research Acad Sinica Shenyang China

Many compressive and tensile tests showed that the room temperature ductility of boron-free Ni_3Al alloy may be markedly improved by a moderate addition of *** ductility of the stoichiometric Ni_3Al and even slightly enriched with Al,may be improved fairly between 400 —600℃,which behaves much better if Zr is added together with ***,the high tem- perature ductility of Ni_3Al alloys containing Cr may be significantly increased by Zr which segregates slightly along grain ***,the toughening mechanism of Zr alloying seems to be different from that of B addition.

关键词： Ni_3Al Zr toughening ductility brittleness

EFFECT OF Zr,Cr AND B ADDITIVES ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ni_3Al ALLOYS

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Acta metallurgica sinica(English Letters) 1990年第3期3卷 170-176页

作者： guo jianting LI Hui SUN Chao ZHU Yaoxiao institute of metal research,academia sinica,shenyang,china guo jianting,Professor,institute of metal research,academia sinica,shenyang 110015,china

The microstructure and the mechanical properties from room temperature up to 1050℃ of Ni_3Al alloys containing 0—0.6 at.-%Zr,0—7.7 at.-%Cr and 0—2.22 at.-%B have been *** was found that the temperature dependence of their yield strength variation reveals to be anomalous,*** strength increases with the temperature raising,and then decreases till it surpassed the peak *** Zr and Zr+Cr may improve the yield strength of the al- loys in the entire range of testing temperatures,as well as the tensile strength and elongation under high temperatures.B is favourable to raise the tensile and yield strengths of the alloys, and also *** the strength will reduce as B added is over 2.22 at.-%.The Ni_(20)Al_3B_6 and Ni_3Al eutectic mixture like islands and globes precipitated inside the grains and along the grain bounderies,which are harmful to the strength and ductility,may be formed when the B content exceeds the limit of solubility.

关键词： Ni_3Al microstructure mechanical property yield strength

YNi_5 PHASE AND ITS EFFECT UPON PROPERTIES OF Ni_3Al ALLOY

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Acta metallurgica sinica(English Letters) 1992年第3期5卷 183-187页

作者： WANG shuhe guo jianting LI Hui SUN Chao TAN Minghui LAI Wanhui institute of metal research,academia sinica,shenyang,china Inst of metal research Acad Sinica Shenyang China

An additive of Y to Ni_3Al based alloy may form a phase YNi_5 which increases in amount with the increase of Y *** was found that the YNi_5 phase in Ni_3Al alloy could remarkably make its grains finer and its grain boundaries more crooked other than *** the Y con- tent≥0.1 wt-%,it occurs as solid solution state and is favorable to high temperature compressive properties and oxidation resistance of the *** Y≥0.3 wt-%,the forma- tion of YNi_5 is predominant in the shape of irregular strips inside Ni_3Al grains and along their grain *** seems to be quite harmful to high temperature strength,ductility and oxidation resistance of the alloy.

关键词： Ni_3Al YNi_5 phase Y compressive property oxidation resistance

Formation Mechanism of NiAl/TiB_2 Nanocomposite by Mechanical Alloying Elemental Powders

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Journal of Materials Science & Technology 1998年第6期14卷 491-496页

作者： Lanzhang ZHOU and jianting guo(institute of metal research, Chinese Academy of Sciences, shenyang 110015, china) institute of metal research Chinese Academy of Sciences Shenyang 110015 China

A NiAl/TiB2 nanocomposite is synthesized by mechanical alloying elemental powders. Upon milling for a certain time, an abrupt exothermic reaction occurs and a large amount of NiAl and TiB2 compounds form simultaneously. It is suggested that two separate chemical reactions,i.e. Ni+Al →NiAl and Ti+2B→TiB2, are involved during the exothermic reaction. Additionof Ti and B to Ni-Al system impedes the structural evolution of Ni and Al powders and delays the abrupt reaction. The final products are equilibrium phases without any metastable phases formed. This type of reaction is suggested to be suitable for alloy systems with two large heatrelease reactions.

关键词： NiAl TiB Formation Mechanism of NiAl/TiB2 Nanocomposite by Mechanical Alloying Elemental Powders

Microstructure of the Ductile Phase in Intermetallic Compound Ni_(50)Al_(20)Fe_(30)

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Journal of Materials Science & Technology 1994年第5期10卷 341-346页

作者： Lianlong HE shuhe WANG jianting guo and Hengqiang YE (Lab. of Atomic Imaging of Solids, institute of metal research, academia sinica, shenyang, 110015, china)(To whom correspondence should be addressed) Lab of Atomic Imaging of Solids Shenyang China

The microstructure of the single hot extruded and annealed Ni50Al20Fe30Y0.003 intermetallic compound alloys has been examined by means of high resolution electron microscopy (HREM). In these extruded and annealed alloys. the ductile phase is of a mixture of the disordered fcc γ matrix and or dered γ' precipitates. This fact well interprets the reason why the degree of annealing treatment can influence the strength and ductility of these alloys. The HREM observation revealed directly that there was some strain concentration at γ'-γ interfaces, due to the presence of more iron atoms in these two phases. The fixed orientation relationship between the γ phase and γ' precipitates was identified to be {001}γ||{00 }γ' and γ|| γ'

关键词： Fe Figure Microstructure of the Ductile Phase in Intermetallic Compound Ni Al

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A Ni_3Al-Fe BASED ALLOY

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Acta metallurgica sinica(English Letters) 1993年第1期6卷 40-45页

作者： LI Hui guo jianting TAN Minghui SUN Chao LAI Wanhui WANG shuhe institute of metal research,academia sinica,shenyang,china Professor,institute of metal research,academia sinica,shenyang 110015,china

The microstructure,tensile properties at 20—950℃ and creep rupture properties at 700- 900℃ in a Ni_3Al-Fe based alloy after high temperature deformation have been *** results show the microstructure of the alloy is composed of γ′-and β-*** grain size and yield strength of the alloy is stable when the temperature≤600℃,and it is ductile at high *** creep of the alloy at 700—900℃ is controlled by the climbing of dislo- cations,and the activation energy for creep is 439 KJ/mol with a stress exponent of 4.

关键词： Ni_3Al-Fe based alloy microstructure mechanical property creep rupture property

EFFECTS OF Cr AND Nb ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Fe_3Al ALLOYS

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Acta metallurgica sinica(English Letters) 1993年第3期6卷 157-160页

作者： SUN Chao guo jianting TAN Minghui LI Hui WANG shuhe institute of metal research,academia sinica,shenyang,china professor,institute of metal research,academia sinica,shenyang 110015,china

The effects of Cr and Nb on tensile properties at room and elevated temperatures and also on the microstructure have been *** improvement in ductiliy plasicity and the cleavage strength of Fe_3AI may result from adding Cr;the improvement is more pronounced at over 400℃.The formation of Fe_2Nb containing A1 precipitates in the Fe_3AI+Nb alloy provide significant strengthening *** of Cr and Nb in Fe_3AI can cause a signifi- cant improvement in the yield strength at 550℃.

关键词： intermetallic compound Fe_3Al alloy mechanical properties Cr Nb

EFFECT OF ALLOYING ELEMENT ON MECHANICAL PROPERTIES OF Fe_3 AL AND FeAI ALLOYS

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Acta metallurgica sinica(English Letters) 1990年第4期3卷 249-255页

作者： guo jianting SUN Chao TAN Minghui LI Hui LAI Wanhui institute of metal research,academia sinica,shenyang,china Professor,institute of metal research,academia sinica,shenyang 110015,china

The effect of alloying element such as Mo,Si or B and its stoichoimetric composition on the tensile properties at room and elevated temperatures,and also on the microstructure of Fe_3Al and FeAl alloys has been *** Fe aluminides were found to be obviously strengthened by all of three elements,but seriously embrittled by Mo and *** improvemen over the plasicity of FeAl may be made by adding B,and the fracture surface is variedfrom intergranular to transgranular cleavage *** room temperature plasticity of the Fe-rich Fe_3Al or Al-rich FeAl is much better than that of the stoichoimetric *** anoma- lous temperature dependence on the yield strength of Fe_3Al in range of 400 to 500℃ or of FeAl in range of 400 to 500℃ was *** has been carried out by the aspect of microstructure.

关键词： intermetallic compound Fe_3Al FeAl mechanical properties alloying element microstructure

CORRELATION BETWEEN OXIDATION BEHAVIOUR AND BORON CONTENT IN Ni_3Al3

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Acta metallurgica sinica(English Letters) 1990年第7期3卷 38-42页

作者： guo jianting SUN Chao LI Hui GUAN Hengrong institute of metal research,academia sinica,shenyang,china guo jianting,Associate Professor,institute of metal research,academia sinica,shenyang,china

The effect of boron content(0 to 2.22 at.-% )on isothermal oxidation behaviour of Ni_3Al at 750 to 1150℃ for 3 to 100 h has been *** results show that the isothermal oxidation kinetics of Ni_3Al with various B contents at different temperatures obeys the parabolic law. The compounds with 0.52 to 1.37 at.-%B show the best oxidation *** morphology and microstructure of the scales have also been investigated.

关键词： intermetallic compound Ni_3Al oxidation boron