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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, har.in institute of technology, har.in 150001, china har.in Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R 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, har.in institute of technology, har.in 150001, china har.in Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R 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, har.in institute of technology, har.in 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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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, har.in institute of technology, har.in 150001, china har.in Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R 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

DSC ANALYSIS OF A CuZnAl TWO WAY SHAPE MEMORY ALLOY DURING AGEING

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中国有色金属学会会刊：英文版 1997年第4期7卷 35-38页

作者： Zhang Jianxin, cai wei, zhao liancheng school of materials science and engineering, har.in institute of technology, har.in 150001

ＤＳＣＡＮＡＬＹＳＩＳＯＦＡＣｕＺｎＡｌＴＷＯＷＡＹＳＨＡＰＥＭＥＭＯＲＹＡＬＬＯＹＤＵＲＩＮＧＡＧＥＩＮＧ①ＺｈａｎｇＪｉａｎｘｉｎ，ＣａｉＷｅｉ，ＺｈａｏＬｉａｎｃｈｅｎｇＳｃｈｏｏｌｏｆＭａｔｅｒｉａｌｓＳｃｉ... 详细信息

ＤＳＣＡＮＡＬＹＳＩＳＯＦＡＣｕＺｎＡｌＴＷＯＷＡＹＳＨＡＰＥＭＥＭＯＲＹＡＬＬＯＹＤＵＲＩＮＧＡＧＥＩＮＧ①ＺｈａｎｇＪｉａｎｘｉｎ，ＣａｉＷｅｉ，ＺｈａｏＬｉａｎｃｈｅｎｇＳｃｈｏｏｌｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｒｉｎｇ...

关键词： shape memory alloy two way shape memory effect thermal analysis degradation

EFFECTS OF HEAT TREATMENT ON TENSILE PROPERTIES AND SHAPE MEMORY EFFECTS OF Ni-Ti-Nb ALLOY

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中国有色金属学会会刊：英文版 1997年第4期7卷 93-97页

作者： Zheng Yufeng, cai wei, Luo Yichun, zhao liancheng school of materials science and engineering, har.in institute of technology, har.in 150001

ＥＦＦＥＣＴＳＯＦＨＥＡＴＴＲＥＡＴＭＥＮＴＯＮＴＥＮＳＩＬＥＰＲＯＰＥＲＴＩＥＳＡＮＤＳＨＡＰＥＭＥＭＯＲＹＥＦＦＥＣＴＳＯＦＮｉＴｉＮｂＡＬＬＯＹ①ＺｈｅｎｇＹｕｆｅｎｇ，ＣａｉＷｅｉ，ＬｕｏＹｉｃｈｕｎ，Ｚ... 详细信息

ＥＦＦＥＣＴＳＯＦＨＥＡＴＴＲＥＡＴＭＥＮＴＯＮＴＥＮＳＩＬＥＰＲＯＰＥＲＴＩＥＳＡＮＤＳＨＡＰＥＭＥＭＯＲＹＥＦＦＥＣＴＳＯＦＮｉＴｉＮｂＡＬＬＯＹ①ＺｈｅｎｇＹｕｆｅｎｇ，ＣａｉＷｅｉ，ＬｕｏＹｉｃｈｕｎ，ＺｈａｏＬｉａｎｃｈｅｎｇＳｃｈｏｏ...

关键词： Ni Ti Nb alloy heat treatment tensile properties shape memory effect

Electrochemical Corrosion Behavior of the DLC Coated and Uncoated NiTi Alloys

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Journal of materials science & technology 2006年第5期22卷 577-580页

作者： Jiehe SUI wei cai liancheng zhao school of materials science and engineering Harbin Institute of Technology Harbin 150001 China

A dense and well-adhered diamond-like carbon （DLC） coating was prepared on the nickel-titanium （NiTi） alloys by plasma immersion ion implantation and deposition （PIIID）. Potentiodynamic polarization tests indicated the corrosion resistance of the NiTi alloys was markedly improved by the DLC coating. The Ni ions release of the NiTi alloys was effectively blocked by the DLC coating.

关键词： NiTi alloys Diamond-like carbon (DLC) Plasma immersion ion implantation and deposition (PIIID) Corrosion resistance

Isothermal martensitic transformation in Ti-Ni-Cu-Co shape memory alloy:Insight from a thermally activated kinetic model

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Journal of materials science & technology 2023年第29期160卷 34-45页

作者： Hao Li Kuishan Sun Xianglong Meng wei cai liancheng zhao school of materials science and engineering Harbin Institute of TechnologyHarbin 150001China

Recently the isothermal martensitic transformation in shape memory alloys(SMAs)has been reported in many literatures,and several models have been proposed to interpret the isothermal and athermal ***,the underlying mechanisms remain inadequately *** this work,the isothermal transformation from B2 to B19 is confirmed in Ti-Ni-Cu-Co melt-spun ribbons at the temperature range between M s and M *** reaches a saturation point at every isothermal temperature T iso,and the saturation points correspond to the f−T curve at the cooling rate of 0.5 K/*** experimental results indicate that the isothermal accumulation of martensite is a relaxation process from the transient state to the thermoelastic balance one.A thermally activated kinetic model is developed in this study to characterize the isothermal and athermal *** model is able to estimate the evolution of martensite volume fraction under any temperature path T(t)and it agrees with the experimental results *** to the model,the effects of elastic energy,nucleation density,and activation energy on the kinetics are *** those,a small nucleation density n i as well as a large activation energy Qwill result in a significant isothermal *** this work,the slighter isothermal effects originate from the higher value of n *** for the non-stoichiometric SMAs,the higher value of Qis responsible for the accumula-tion of martensite at the isothermal ***,the present work provides a novel view from a kinetic model to understand the isothermal martensitic transformation in SMAs.

关键词： Shape memory alloys Thermoelastic martensitic transformation Kinetics Thermal activation

Microstructure evolution and superelasticity behavior of Ti-Ni-Hf shape memory alloy composite with multi-scale and heterogeneous reinforcements

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Journal of materials science & technology 2020年第7期42卷 113-121页

作者： Xiaoyang Yi Bin Sun weihong Gao Xianglong Meng Zhiyong Gao wei cai liancheng zhao school of materials science and engineering Harbin Institute of TechnologyHarbin 150001China

In the present study,the in-situ TiB whisker was introduced into the Ti-Ni-Hf shape memory alloy composite by the in-situ reaction of the Ti-Ni-Hf alloy powder and TiB2 ***(Ti,Hf)2 Ni phase also precipitated,accompanied with the formation of TiB ***,the residual TiB2 particles can be observed,as the TiB2 content was higher than 0.7 wt%.Thereinto,the larger scale reinforcements constituted the quasi-continuous network *** smaller scale reinforcements distributed in the interior of the network *** two-scale reinforcements showed the uniform distribution at macroscopic level and inhomogeneous distribution at microscopic *** single stage B19?B2 martensitic transformation occurred in the Ti-Ni-Hf *** addition,the martensitic transformation temperatures continuously decreased with the increased TiB2 content owing to the compositional and mechanical *** moderate TiB2 addition not noly enhanced the matrix strength,but also significantly improved the *** excellent superelaticity with the completely recoverable strain of 4%can be obtained in the Ti-Ni-Hf composite containing 0.7 wt%TiB2.

关键词： Ti-Ni-Hf composite Shape memory alloy Microstructure Martensitic transformation High temperature superelasticity

Phase Transformation and Thermal Stability of Aged Ti-Ni-Hf High Temperature Shape Memory Alloys

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Journal of materials science & technology 2006年第5期22卷 691-695页

作者： Xianglong MENG wei cai K.T.Lau L.M.Zhou liancheng zhao school of materials science ＆ engineering Harbin Institute of Technology Harbin 150001 China Department of Mechanical engineering The Hong Kong Polytechnic umversity Hung Horn KowloonHong Kong China

The use of Ni-rich TiNiHf alloys as high temperature shape memory alloys （SMAs） through aging has been presented. For Ni-rich Ti80-xNixHf20 alloys, their phase transformation temperatures are averagely increased more than 100 K by aging at 823 K for 2 h. Especially for the alloys with Ni-content of 50.4 at. pct and 50.6 at. pct, their martensitic transformation start temperatures （Ms） are more than 473 K after aging. TEM observation confirmed that some fine particles precipitate from the matrix during aging. The aged Ni-rich TiNiHf SMAs show the better thermal stability of phase transformation temperatures than the solutiontreated TiNiHf alloys. The fine particles precipitated during aging should be responsible for the increase of phase transformation temperatures and its high stability.

关键词： TiNiHf alloy High temperature shape memory alloy Aging Phase transformation