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New Metal Materials (a)


Goods production. Mass production capacity of AA batteries 1450rm ~ _h, 1C charge and discharge the battery life of more than 600 times the performance and production technology has reached the international advanced level. Peace Bay have been completed, j P and Zhejiang Zhongda three pilot production lines, an annual production capacity of 80 million. In addition, the NiMH batteries for electric vehicles have also been developed, but still need to raise the level. 3.1.3 Functional Structural Materials - Shape Memory Taijin 'many intermetallic compounds under certain conditions martensitic transformation occurs, leading to shape memory effect. There are several different shape memory effect: when the parent phase after the stress induced by the formation of martensite and strain occurs when the stress removed, the martensite disappears, change tends to respond directly, known as the pseudo-elastic shape memory effect; alloys have martensitic transformation during cooling, and then change shape by plastic deformation, and then heated back to a reverse phase transition when the parent phase, the gradual recovery strain, the martensite completely disappear, to return fully to the parent phase original shape, known as plasticity of the shape memory effect (or one-way shape memory effect); some alloys not only the shape of the original parent phase has a memory effect, and when then when you can back the cooling into martensite martensite shape, called two-way shape memory effect: but this response is often incomplete, so two-way shape memory effect requires repeated up to 10 times more thermal mechanical treatment, that is repeated at a certain temperature stressing stretch and recovery or,[link widoczny dla zalogowanych], in certain repeated heating and cooling under stress,[link widoczny dla zalogowanych], to remember the shape of the force martensitic thermoelastic shape memory effect is a special performance of martensite, shape memory alloys have the effect of thermoelastic martensitic change. When the martensite by stress, the martensite internal organization,[link widoczny dla zalogowanych], that is, twins or stacking faults, re-orientation and stored energy. The reverse transformation of stress when removing or re-orientation of reversible grow, forming the shape memory effect. 1951 found that the shape memory alloy is Au-cd alloys, 1953 to find that In-Tl alloy, Ti-Ni alloy 4 Guoliang: new metal materials (a) and copper alloys have shape memory effect. For example, Au a 46.5/50Cd, Ti a 49/51Ni, In a 18/23T1, Ni a 36/38A1, Cu a 15.3Zn, Cu such a 38.5/41.5Zn: 3 brass at room temperature there will be one-way pseudo-elastic shape memory effect, In a. ri and. ri-Ni and other alloys have two-way memory effect. Recently found that not only ordered alloys have shape memory effect, and some disordered alloys, such as iron-based shape memory alloy Fe a 25Pt, Fe-Pd, Fe-Mn-Si, Fe-Ni-Co-Ti, Fe-Cr -Ni-Mn-si-co alloys have shape memory effect of shape memory alloy first F-14 aircraft be applied, so titanium hydraulic tube connection ring, the process is: first at room temperature for the TiNi shape memory alloy processed into connection ring but its inner diameter slightly smaller than the diameter of titanium hydraulic tube, and then cooling rate at low temperature, force, after expanding 8% of the titanium hydraulic lines in the slide, when to return to room temperature,[link widoczny dla zalogowanych], TiNi shape memory alloy connecting ring back fastening to the original size, resulting in shrinkage to tighten the connection titanium hydraulic tube: There are similar-shaped 9 shape memory alloy such as electrical connectors, which is the largest application areas: Recently, shape memory alloys more widely used in biomedical Lie such as making blood clots in the mesh separator, the first fold in less than body temperature and placed under the vein, when the temperature increases to body temperature, the net separation of high regard and started. Shape memory alloy in terms of body repair is increasingly used, for example, used to make bone plates,[link widoczny dla zalogowanych], nails and repair dental appliances, the use of shape memory effect so that the pressure between the broken bones and make a good connection between the broken bones. Promote the use of shape memory alloy repair the broken bones do trigger, or trigger switch is widely used, the use of low-temperature shape memory alloy spring is usually lower than the effective elastic modulus of the spring, while the high temperature characteristics of the opposite, so gentle can control the shape memory alloy spring way back and forth movement, from the priming effect of this thermal activation trigger switch has many applications in household appliances In addition, the shape memory alloy is doing mobile phone antenna, spectacle frames, and many other activities have applications (continued) Received Date :2001-12-10VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV ● ● ● ● ● ● ● ● ◆ ●? Information Report ● _. ◆ ● ● ● ◆ ● Wuhan Iron and Steel with a domestic and international iron ore prices according to the British Journal \Xu group feed

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