Cu对8030铝合金组织与性能的影响

利用金相显微镜、扫描电镜、万能试验机和导电仪等分析测试了不同Cu含量的8030铝合金的显微组织和性能。结果表明,随着Cu含量增加,8030铝合金的抗拉强度有所提高,伸长率下降,电导率上升。     

钛基复合材料的耐腐蚀性能研究

通过电化学测试和浸泡试验,研究了增强相含量对钛基复合材料在3．5％NaCl水溶液中耐蚀性的影响,并与纯钛的耐蚀性进行了对比。结果表明,与纯钛相比,复合材料的耐蚀性能有所下降,随着增强相含量的增多,复合材料的腐蚀越来越严重,TiC颗粒及其与Ti的界面对复合材料钝化膜的形成有重要影响。经EDS和XRD证实,腐蚀表面的钝化膜主要由TiO2组成。     

Zr与固溶处理对Mg-1.5Zn-0.5Ca-0.8Ce合金耐腐蚀性能的影响

以Mg-1.5Zn-0.5Ca-0.8Ce合金作为研究对象,分别进行合金化和固溶处理,研究Zr的添加及固溶处理对镁合金Mg-1.5Zn-0.5Ca-0.8Ce耐腐蚀性能的影响,并探究合金化和热处理对镁合金耐腐蚀性能影响机理.结果表明:Zr的加入和固溶处理均有效提高了材料的耐腐蚀性,其中Mg-1.5Zn-0.5Ca-0....     

富钛的TiNi记忆合金薄膜组织结构

探讨了用ＨＣＤ法在玻璃基板上制备的Ｔｉ－４３．２７％Ｎｉ形状记忆合金薄膜和经不同热处理后的组织结构，结果表明，当镀膜的基板温度较高时，所得的薄膜基本晶化，其组织为由马氏体、Ｒ相、母相和Ｔｉ２Ｎｉ析出相等组成的多晶体。经热处理后，母相量增加，马氏体量减少，表明热处理使Ｍｓ点下降，利用这一现象，可扩大记忆合金薄膜的旷工 由曙加热到１１０℃的动态观察中发现，多晶体中的马氏休逐步缩小，消失，转变成母相、Ｒ     

硫化铟对ZL108铝合金微弧氧化膜层结构和耐腐蚀性能的影响

在含有In2S3的硅酸盐电解液中对ZL108铝合金进行了微弧氧化处理.采用扫描电镜(SEM)、光学轮廓仪、X射线衍射(XRD)、X射线光电子能谱(XPS)和电化学工作站等检测手段,研究了添加In2S3对MAO膜层微观结构、相组成和耐蚀性等的影响.结果表明,In2S3的加入提高了微弧氧化电压,使膜层成膜速率增加,从而导致...     

热处理对Ni-B涂层耐腐蚀性能的影响

采用低温化学镀液相沉积技术,以45钢为基体材料,制备了Ni-B合金镀层.利用光学显微镜观察了镀层的微观形貌,借助X射线衍射仪分析了热处理前后Ni-B镀层相结构的变化,采用电化学极化曲线表征了热处理前后镀层的腐蚀过电位.结果表明:Ni-B镀层与45钢基体结合较好,界面连续、均匀、平整,表面形貌呈菜花状的胞状结构.NaBH-4的添加量为0.9g/L时,Ni-B镀层呈非晶态,Ni-B镀层的耐蚀性最好.热处理后,镀层由非晶态向晶态转变,镀层的耐蚀性下降.     

Surface alloying of Cu with Ti by double glow discharge process

The surface of pure copper alloyed with Ti using double glow discharge process was investigated. The morphology, structure and forming mechanism of the Cu-Ti alloying layer were analyzed. The microhardness and wear resistance of the Cu-Ti alloying layer were measured, and compared with those of pure copper. The results in-dicate that the surface of copper activated by Ar and Ti ions bombardment is favorable to absorption and diffusion of Ti element. In current experimental temperature, as the Ti content increases, the liquid phase occurs between the deposited layer and diffused layer, which makes the Ti ions and atoms easy to dissolve and the thickness of Cu-Ti al-loying layer increase rapidly. After cooling, the structure of the alloying layer is composed of CuTi, Cu4Ti and Cu(Ti) solid solution. The solid solution strengthening and precipitation strengthening effects of Ti result in high surface hardness and wear resistance.     

高强度耐腐蚀铝合金的研究进展

综述了近年来高强度耐腐蚀铝合金的研究现状,列举了几种应用较广、研究较深入的高强度耐腐蚀铝合金,并对其合金组成和热处理影响进行了讨论。总结探究了常用微量元素对铝合金强度及耐腐蚀性的影响及机理,并阐述了新型腐蚀表征手段和研究方法。同时指出,淬火速率和自然时效对合金性能影响的研究尚不全面,合金微观腐蚀研究及应力腐蚀理论仍有待进一步深入。     

生理环境中TiNi形状记忆合金耐蚀性研究进展

对TiNi形状记忆合金在体外及体内两种生理环境中的 耐蚀性研究进行了综述,阐述了其阳极极化性能、孔蚀发生机理及表面状态、模拟介质及 合金成份对耐蚀性的影响,并展望了其发展趋势.     

OXIDE FILM ON EQUIATOMIC TiNi SHAPE MEMORY ALLOY

１ＩＮＴＲＯＤＵＣＴＩＯＮＥｑｕｉａｔｏｍｉｃＴｉＮｉｓｈａｐｅｍｅｍｏｒｙａｌｏｙ（ＳＭＡ）ｉｓａｎｏｖｅｌａｎｄｐｒｏｍｉｓｉｎｇｂｉｏｍａｔｅｒｉａｌｄｕｅｔｏｉｔｓｕｎｉｑｕｅａｎｄｅｘｃｅｌｅｎｔｓｈａｐｅｍｅｍｏｒｙｅｆｅｃｔａｎｄｓｕｐ...     

PREPARATION OF TiNi SHAPE MEMORY ALLOY POROSINT BY SHS

ＰＲＥＰＡＲＡＴＩＯＮＯＦＴｉＮｉＳＨＡＰＥＭＥＭＯＲＹＡＬＬＯＹＰＯＲＯＳＩＮＴＢＹＳＨＳ①ＣｈｕＣｈｅｎｇｌｉｎ，ＬｉＢｏ，ＷａｎｇＳｈｉｄｏｎｇ，ＺｈａｎｇＳｈｕｇｅ，ＹａｎｇＸｉａｏｘｉ，ＹｉｎＺｈｏｎｇｄａＢｏｘ４...     

FeMnSiCr合金的耐腐蚀及生物相容性研究

采用浸泡实验和血液相容性实验,研究了FeMnSiCr、NiTi 合金及316L不锈钢在NaCl、NaOH和HCl溶液中的耐蚀性及在血液中的生物相容性.结果表明,在3种溶液中,FeMnSiCr合金耐蚀性比NiTi合金稍好,但不如316 L不锈钢;FeMnSiCr合金与316 L不锈钢相比,凝血时间延长,溶血率下降,与NiTi合金相近,具有较好的血液生物相容性.     

TiNi形状记忆合金中的亚稳相SCIEI

用选区电子衍射结合约化胞程序分析的方法，发现在缓冷的ＴｉＮｉ合金中存在以（１／２）〈００１〉和（１／８）〈２１０〉超点阵衍射斑点为特征的亚稳相──ｘ相，它属于单斜晶系，其点阵常数为：ａ＝０．６６９ｎｍ，ｂ＝０．６０３ｎｍ，ｃ＝０．９５１ｎｍ和β＝９５°。     

Ni含量对TiNi形状记忆合金相变行为的影响

用示差扫描热分析仪和光学显微镜系统研究了Ｎｉ含量对ＴｉＮｉ形状记忆合金Ｒ相和Ｍ相相变温度，相变热，热滞的影响。结果表明：在加热和冷却过程中，Ｔｉ－３３．３％Ｎｉ和Ｔｉ－７５．０％Ｎｉ不发生相变；ＴＭ，ΔＭ，ΔＨＭ和ΔＨＲ是Ｎｉ是含量的函数，ＴＲ和ΔＲ基本为一定值，与Ｎｉ含量有关。     

INFLUENCE OF PROCESSING ON SHAPE MEMORY EFFECT OF Fe-Mn-Si-Ni-C-RE SHAPE MEMORY ALLOY

Effect of carbon, compound RE, quenching temperature, pre-strain and recovery temperature on shape memory effect (SME) of Fe-Mn-Si-Ni-C-RE shape memory alloy was studied by bent measurement, thermal cycle training, SEM etc. It was shown that the grains of alloys addition with compound RE became finer and SME increased evidently. SME of the alloy was weakening gradually as carbon content increased under small strain (3%). But in the condition of large strain (more than 6%), SME of the alloy whose carbon content range from 0.1% to 0.12% showed small decreasing range, especially of alloy with the addition of compound RE. Results were also indicated that SME was improved by increasing quenching temperature (>1000℃). The amount of thermal induced martensite increased and the relative shape recovery ratio could be increased to more than 40% after 3-4 times thermal training. The relative shape recovery ratio decreased evidently depending on rising of pre-strain. Furthermore, because speed of martensite transi     

MARTENSITE AND REVERSE TRANSFORMATION IN PRESTRAINED TiNi SHAPE MEMORY ALLOY THIN FILM

The effect of pre-strain on phase transformation of TiNi shape memory alloy film was studied by differential scanning calorimeter measurement (DSC). Compared with un-defarmed TiNi film, the reverse transformation of pre-strained specimens was elevated to a higher temperature on the first heating, but martensite and reverse transformation on subsequent thermal cycles occurred at a lower temperature. The evolution of transformation behavior in pre-strained TiNi film was related to the change of elastic strain energy, irreversible energy and internal stress field.     

约束态TiNi形状记忆合金丝可逆形状响应应变和响应力的分析模型

建立了TiNi形状记忆合金（SAM）主导的金属基或聚合物基智能复合材料中TiNi丝形状响应应变和响应力的分析模型，并进行了计算分析和实验考察，计算和实验结果符合良好，结果表明，当基体预定曲率km一定时，随TiNiSMA丝数量n增加，智能复合材料的形状响应应变ε和响应力F增加，形状回复率ρ减小；随基体宽度b增加，ε和F皆减小，而ρ则增加。当b一定时，随n增加，ε和F皆增加；随km增加，F增加，ε则基本保持不变。因此，设计该类智能复合材料时应综合考虑增强材料数量，基体尺寸及其预变形量等因素。     

TiNi薄膜马氏体稳定化及其形状记忆效应研究

用DSC研究了预变形对Ti51Ni49形状记忆合金薄膜的相变行为的影响，结果表明：预变形后薄膜的马氏体发生了稳定化现象，第一次逆相变温度T^1A随预应变量增加而升高，而在第二次相变循环中，马氏体稳定化现象消失，逆相变温度T^2A基本恢复到变形前的温度值，马氏体相变温度随预应变量增大而降低，但R相变受预变形影响不大，形状记忆效应研究表明，Ti51Ni49合金薄膜的可恢复应变随预应变量的增加而增大，其最大值4．5％在预应变量为6％时获得。