LIN Guangming CHENXingyuan ZHANG Jinxiu Material Science Research Institute
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Zhongshan University
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Guangzhou
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China WANG Yurui Metallurgy Research Institute of Beijing Iron and Steel Company
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Beijing
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China LIN Guangming Associate Professor
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Department of Physics
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Zhongshan University
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Guangzhou 510275
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China
金属学报(英文版)
Snap-acting two way shape memory device can be obtained by using the design proposed by authors.Some essential parameters which characterize the properties of device have been pro- posed also in this paper.And the principle and method according to which a practical snap-acting device can be designed have been described.
关键词:
shape memory alloy
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null
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null
LIN Guangming HUANG Yuanshi ZHANG Jinxiu Zhongshan University
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Guangzhou
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China LIN Guangming
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Associate Professor
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Dept.of Physics
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Zhongshan University
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Guangzhou 510275
,
China
金属学报(英文版)
The snap-acting transition and two way shape memory (TWSM) effect have been obtained in a TWSM spring made of Ni51Ti49 alloy using the constrained effect of stress on driving force of TWSM material.When the snap-acting transition has been realized:M_s= M_f and A_s=A_f;hysteresis is rectangular,the height (TWSM effect) and width (hysteresis) of the rectangle can be readjusted by means of constrained stress.The results of resistance measurments show that,the snap-acting TWSM effect mentioned above was supplied mainly from the transformation of P←→R.The thermodynamic model has also been proposed to ac- count for the snap-acting transformation.
关键词:
transformation thermodynamics
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null
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null
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B.W. Wang
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H. Shen
金属学报(英文版)
Ni-Cr System solar selective thin solid films were prepared by d.c. magnetron reactivesputtering under the atmosphere of O2 and N2. Ni-Cr alloy was chosen as targetmaterial and copper sheets as substrate. Using SEM, Spectrophotometer and Talystepto analyze the relations between the selective characteristic and the structure, theformation and the thickness of the thin films. The aim is to obtain good solar selectivethin films with high absorptance and low emittance, which is applied to flat plate solarheat collectors.
关键词:
solar selective thin film
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null
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null
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张宇
,
黄勇平
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麦堪成
高分子材料科学与工程
用熔融法制备了马来酸酐(MAH)及其与苯乙烯(St)混合单体改性PP/PS共混物,以及MAH、St改性聚丙烯(原位形成PP/PS共混物).用DSC、DMA和FT-IR研究了改性共混物的结晶与熔融行为、动态力学性能和接枝产物.结果表明,MAH加入对PP/PS共混物中PP的结晶温度影响不大,但其与St混合单体对共混物中PP的结晶温度影响明显,原位生成PP/PS的结晶温度也有较大提高.改性对共混物中PP的熔融温度影响不大,但熔融峰形变化明显.改性PP/PS共混物具有高的E′和E″强度.教育部聚合物基复合材料及功能材料重点实验室, 广东广州 510275)
关键词:
反应性单体
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结晶与熔融行为
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动态力学性能
