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Relationship between Colored Microstructure under Polarized Light and Shape Recovery Characteristics on the Thermomechanical Cycled CuAlNi Single Crystals

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Journal of materials science & technology 2001年第5期17卷 485-489页

作者： Qingfu CHEN, wei cai and Liancheng ZHAO school of materials science and engineering, harbin institute of technology, harbin 150001, china Dept. of Mater. and Chem. Eng. Liaoning Inst. of Technol. Jinzhou 121001 China

The paper studied the relationship between microstructure and shape recovery characteristics by using colored microstructure analysis under polarized light on the thermomechanical cycled CuAlNi single crystals. The two-way shape memory effect in quenched thin bar resulted from the preferential formation/extinction of martensite variant due to the internal quench stress, and the variant was formed at an angle of about 45 deg. with the tension direction ([001] of the βphase). Initial thermomechanical cycling under relatively low stress single variant stress-induced martensite was formed at an angle of 45 deg. with the tension and its morphology was a lath of parallel twins. More than one group of variants were formed after several training cycles and such variants also caused tilting of some thermally formed accommodated martensite. By overheating the trained sample containing stabilized multi-variants of stress-induced martensite, very coarse martensite structure with a strong asymmetry was produced, which caused the reverse two-way shape memory effect.

关键词： Relationship between Colored Microstructure under Polarized Light and Shape Recovery Characteristics on the Thermomechanical Cycled CuAlNi Single Crystals

Two-way Shape Memory Effect in a Ti-Ni-Nb Shape Memory Alloy with Wide Hysteresis

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Journal of materials science & technology 2001年第1期17卷 13-14页

作者： Liming WANG Xianglong MENG wei cai and Liancheng ZHAO school of materials science and engineering, harbin institute of technology, harbin 150001, china Sch. of Mater. Sci. Harbin Inst. of Technol. Harbin 150001 China

A two-way shape memory effect (TWSM E) in the Ti46.3Ni44.7Nb9 alloy has been systematically investigated by means of bending test and transmission electron microscopy (TEM ) observations. Based on the analysis of the ... 详细信息

关键词： Ti Ni Two-way Shape Memory Effect in a Ti-Ni-Nb Shape Memory Alloy with Wide Hysteresis Wide

Mobility of Various Intervariant Interfaces in 18R Martensite in a Cu-Zn-Al Alloy Part Ⅰ: In-situ Observations

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Journal of materials science & technology 1998年第4期14卷 251-254页

作者： Jianxin ZHANG wei cai Yufeng ZHENG and Liancheng ZHAO(school of materials science and engineering, harbin institute of technology, harbin 150001, china) school of materials science and engineering Harbin Institute of Technology Harbin 150001 China

The motion of intervariant intedeces under the action of applied stress in the internally faulted 18R martensite in a Cu-Zn-Al shape memory alloy has been studied. Transmission electron microscopy in situ observations show that the interfaces between 24 martensite variants have different reaction to applied stress. The A/C type and A/B type interfaces have good mobil-ity, the A/D type interface has bad mobiIity, and the different-group-intervariant interfaces are basically immobile.

关键词： Zn Al In-situ Observations Mobility of Various Intervariant Interfaces in 18R Martensite in a Cu-Zn-Al Alloy Part Cu

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Deformation Processed Cu-15 wt pct Cr Composite Synthesized by Hot Hydrostatic Extrusion of Mechanical Milled Powders

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Journal of materials science & technology 2003年第5期19卷 507-508页

作者： Jinglei liu, Zuyan liu and Erde WANGschool of materials science and engineering, harbin institute of technology, harbin 150001, china school of materials science and engineering Harbin Institute of Technology Harbin 150001 China

A novel technique was developed for the preparation of Cu-15 wt pct Cr composite with high strength and conductivity. The composite powders with refined microstructure and curly lamellae strengthening phase was first prepared by mechanical milling in favorite milling time and then were hot hydrostatic extruded after pre-densification with sintering or hot pressing. It was shown that the extrusion densified the composite powders well and at the same time the chaos curled strengthening phase was aligned into lines and further deformed as strengthening ribbons. The deformation processed Cu-15 wt pct Cr composite prepared by this technique is of superior conductivity, strength and thermal stability.

关键词： Mechanical milling Hydrostatic extrusion Deformation processed composite Copper-base composite

Effect of Thermal Cycling under Load on Martensite Transformation and Two-way Shape Memory Effect in a TiNi Alloy

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Journal of materials science & technology 2001年第2期17卷 263-266页

作者： Liming WANG, Yufeng ZHENG, wei cai, Xianglong MENG and Liancheng ZHAO school of materials science and engineering, harbin institute of technology, harbin 150001, china Sch. of Mat. Sci. Harbin Inst. of Technol. Harbin 150001 China

The effect of thermal cycling under loading on martensitic transformation and two-way shape memory effect was investigated for Ti-49.8 at, pet Ni alloy. It is shown that M(s), and M(f) temperature increase with increasing the number of cycles, while A(s) and A(f) temperature decrease during thermal cycling. The total strain at and permanent strain epsilon (p) increase with increasing applied stress and number of cycles. The two-way shape memory effect can be improved by proper thermal cycling training under loading, while excessively high applied stress results in the deterioration of TWSME. The reason for the changes in martensitic transformation characteristics and two-way shape memory effect during thermal cycling under loading is discussed based on the analysis of microstructure by TEM observations.

关键词： TiNi Effect of Thermal Cycling under Load on Martensite Transformation and Two-way Shape Memory Effect in a TiNi Alloy

Effect of Triple Annealing Treatment on Stress Relaxation of Ti-6Al-4V Alloy

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Journal of materials science & technology 2004年第3期20卷 292-294页

作者： Yong liu Jingchuan ZHU Zhongda YIN Mingwei LI school of materials science and engineering, harbin institute of technology harbin 150001,china Sch. of Mat. Sci. and Eng. Harbin Inst. of Technol. Harbin 150001 China

The effect of triple annealing on stress relaxation of Ti-6Al-4V alloy as well as the microstructure after stress relaxation werestudied. The results showed that triple annealing treatment enhanced the resistance of stress relaxation performance, andwhen the temperature was rising, this effect became notable. The stress relaxation deformation mechanism is of dislocationcreep at 400℃ and recovery creep at 600℃.

关键词： Triple annealing Ti-6Al-4V alloy Stress relaxation

EFFECT　OF　MILLING　INTENSITY　ON　STRUCTURAL　CHANGES　OF　MIXED　Al－Fe－Ni　POWDERS　IN　MECHANICAL　ALLOYING　PROCESS

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中国有色金属学会会刊：英文版 1996年第3期6卷 143-145,149页

作者： liu Zuyan Liang Guoxian Wang Erde(school of materials science and engineering,harbin institute of technology, harbin 150001) school of materials science and engineering Harbin Institute of Technology Harbin 150001 China

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关键词： Al-Fe-Ni powder structural change milling intensity mechanical alloying

Microstructure,compression property and shape memory effect of Ru-Nb high temperature shape memory alloy

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Rare Metals 2007年第S1期26卷 51-55页

作者： GAO Xin,cai wei,and GAO Zhiyong school of materials science and engineering,harbin institute of technology,harbin 150001,china harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The microstructure,phase transformation,compression property and strain recovery characteristics of equiatomic Ru-Nb high temperature shape memory alloy were investigated by means of optical microscope,X-ray diffraction(XRD),differential scanning calorimetry(DSC),compression tests and transmission electron microscopy(TEM).When cooling the alloy specimen from high temperature to room temperature,β(parent phase)→β’(interphase)→β″(martensite) two step phase transformation *** microstructure at room temperature shows regularly arranged band morphology with the monoclinic crystal *** twinning relationship between the martensite bands was determined to be(101) Type *** and of the martensite bands inside the variant and dislocation were found during compression at room *** maximum complete recovery strain is about 1.5%.

关键词： Ru-Nb alloy phase transformation microstructure shape memory effect

Effect of Annealing Temperature on the Formation of Silicides and the Surface Morphologies of PtSi Films

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Journal of materials science & technology 2001年第1期17卷 39-40页

作者： Jinghua YIN Meicheng LI Yufeng ZHENG Zhong WANG wei cai Peilin WANG school of materials science and engineering, harbin institute of technology, harbin 150001, china Sch. of Mater. Sci. and Eng. Harbin Inst. of Technol. Harbin 150001 China

The effect of annealing temperature on the formation of the PtSi phase. distribution of silicides and the surface morphologies of silicides films is investigated by XPS. AFM. It is shown that the phase sequences of the films change from Pt-Pt2Si-PtSi-Si to Pt+Pt2Si+PtSi-PtSi-Si or Pt+Pt2Si+PtSi-PtSi-st with an increase of annealing temperature and the reason for the formation of mixed layers is discussed.

关键词： Effect of Annealing Temperature on the Formation of Silicides and the Surface Morphologies of PtSi Films