材料期刊网

Measurements of Stress-dependence of Hysteresis in a NiTi Shape Memory Alloy

XU Huibin B.Hinz FU Senlin Technische Universitat Berlin , SG2 , Salzufer 17-19 , W 1000 Berlin 10 , GermanyZhejiang University , Hangzhou , 310027 , China.

材料科学技术（英文）

关键词: martensitic transformation , null , null

GEOMETRIC MODEL AND APPLIED METHOD FOR THE CALCULATION OF GRAIN SIZE DISTRIBUTIONS

ZHAO Xinbing Zhejiang University , Hangzhou , China LCKEK Institut fur Metallkunde und Metallphysik der RWTH Aachen , Germany Department of Materials Scicnce and Engineering , Zhejiang Univer sity , Hangzhou 310027 , China

金属学报(英文版)

Most of the available methods for the calculation of the three dimensional(3D)grain size dis- tribution functions(SDF)are based on the S model and lead a grave systematical error.The origin is the basic supposition of spherical grains in the S model,which does not correspond with the feature of real grains.A new model called A model is developed based on the hypothe- sis of polvhedral grains.The probability functions of the A model and the method to calculate the 3D SDFs using the A model are given in the present paper.The theoretical analyses and experimental tests have demonstrated that the A model reduces the systematical error radical- ly.It is nearly as simple as the so far used S model,but gives much better results in repro- ducing of 3D SDFs from the measured ID or 2D SDFs.

关键词: grain size , null , null , null

MECHANISM OF DEUTERIUM CRACKING IN PALLADIUM

SUN Dalin LEI Yongquan CHEN Yanglin WU Jing WANG Qidong Zhejiang University , Hangzhou , China Department of Materials Science and Engineering , Zhejiang University , Hangzhou 310027 , China

金属学报(英文版)

After 290 h electrochemical charging of deuterium,the density of dislocation in well-annealed Pd was increased from 10~8/cm~2 to over 10~12/cm~2 and a large amount of bubble-like voids or cracks was observed by optical and transmission electron microscopes.The mechanism of deuterium cracking is believed due to the formation of molecular De during the segregstion and combination of deuterium atoms around dislocations.XRD results showed that the lattice constant of Pd increased from 0.3890 nm to 0.4034 nm.

关键词: deuterium cracking , null

DAMPING PROPERTIES OF MARTENSITE AND MARTENSITIC TRANSFORMATION IN CuZnAl ALLOYS

CHENG Yixuan CHEN Jiqin FANG Xiaomin L(?) Weiping Zhejiang University , Hangzhou , China

金属学报(英文版)

The internal friction of alloys in martensite state is believed to be an M/M interface one, which can be explained by an expression deduced from the theory of dislocation internal fric- tion.The internal friction during martensitic transformation consists of two parts,including those of the M/M interface and of the phase transformation.The latter is further composed of two portions,the major one produced by reverse martensitic transformation and the other from stress-induced martensite.It was also found that the degradation of damping properties of the CuZnAl alloys is related to the dislocation,which is introduced from the exciting pro- cess,and tends to be of stable value after certain excitements.

关键词: damping property , null , null , null