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Isothermal Aging Kinetics in CuZnAl Shape Memory Alloy

Zengqi ZHAO Lab.of Physics , Baotou Research Institute of Rare Earth , Baotou , 014010 , ChinaFeixia CHEN Dazhi YANG Dept.of Mater.Eng. , Dalian University of Technology , Dalian , 116024 , ChinaEr BAO Dept.of Mater.Eng. , Yanshan University , Qinhuangdao , 066004 , China

材料科学技术（英文）

Isothermal aging behaviours of a CuZnAl shape memory alloy have been investigated by means of dilatometry.The length of the specimens during isothermal aging from 190 to 280℃ increases with the aging time at each temperature.The isothermal aging kinetics fits in Avrami equation and the time exponent n decreases with the increase in aging temperature.The apparent activation energy for the isothermal aging process was measured to be 109.0kJ/mol,which is about equal to that of a relaxation internal friction peak at about 200℃ (f≈1 Hz) in the alloy.

关键词: isothermal aging kinetics , null , null , null , null

Effect of Ni on Sintering Characteristics of Short Cast Iron Fibre

LI Dongchun TIAN Yongjun CHEN Shizhen YU Dongli HE Julong ** Yanshan University , Qinhuangdao , 066004 , China+ To whom correspondence should be addressed

材料科学技术（英文）

Nickel,as the carrier through which Fe atoms diffuse,obviously enhances the densification of sintered compact containing short cast iron fibre. When Ni content is above 4.5 wt-% there are some austenites in microstructure at room temperature, discontinuous cementite networks at the interfaces between austenites and pearlites,free graphite pre- cipitated in austenite and pores and Widmannst(?)tten carbide precipitated in austenite. When Ni content is about 12 wt-%,it leads to de- crease in densification ratio and change in fracture morphology of sintered compact from ductile to brittle.

关键词: short metal fibre , null , null

Transverse Distributions of Front and Back Tension Stresses in Cold Strip Rolling

LIU Hongmin LIAN Jiachuang ** Yanshan University , Qinhuangdao , Hebei Province , 066004 , China+ To whom correspondence should be addressed

材料科学技术（英文）

In this paper,such a new lateral displacement function is proposed that the lateral flow velocity is con- tinuous at the entry and the exit of deformation zone.A new kind of finite strip method—the third power B-spline finite strip method—is put forward to simulate strip rolling process.Front and back tension stresses are formulated.The computed results of the transverse distributions of the front and back tension stresses are close to the experimental results.The paper lays a foundation for further analysing the three-dimensional stresses and deformations of strip rolling.

关键词: cold strip rolling , null , null , null

化学镀NiCOB合金对人造金刚石抗氧化的影响

关长斌 , 周振君 , 于金库

中国腐蚀与防护学报

化学镀ＮｉＣＯＢ合金对人造金刚石抗氧化的影响关长斌，周振君，于金库（燕山大学秦皇岛０６６００４）人造金刚石由石墨十触媒合金在高温超高压下合成，因此是一种亚稳相，耐热性差。在空气中加热到７００℃以上就会明显氧化和石墨化，使强度降低，影响应用。如制作磨具时，使热压烧结温度和焊接温度都受到限制。为了提高人造金刚石的氧化性能，目前国内外都采用镀单一的金属层，如镀Ｎｉ，Ｃｕ或Ｔｉ等［１～３］，但效果均?...

关键词: null , Synthetic diamond , Resistance to oxidation

镀液中的稀土元素对Ni-P合金镀层耐蚀性能的影响

邵光杰 , 王玉林 , 沈德久 , 于金库

中国腐蚀与防护学报

镀液中的稀土元素对Ｎｉ－Ｐ合金镀层耐蚀性能的影响邵光杰，王玉林，沈德久，于金库（燕山大学材料工程系秦皇岛０６６００４）１前言电刷镀Ｎｉ－Ｐ合金镀层作为设备的局部防护处理手段已经得到了广泛应用。但单纯的Ｎｉ－Ｐ合金镀层还不能满足某些部门的要求，进一步提高镀层的耐蚀性能已引起表面处理工作者的注意［１］。本工作研究稀土在电刷镀Ｎｉ－Ｐ合金镀层中的作用。２实验方法基础镀液中的镍离子含量为６０ｇ／Ｌ，?...

关键词: null , Ni-P alloy , Amorphous , Corrosion resistance

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