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laminated metal composite is a new kind of material that is made from two or more types of metals possessing different physical, chemical and mechanical properties via composite technology that obtains strong metallurgical bonding between interfaces. It can lower the cost, improve properties and economize noble metal. The booming of industry and defense technology as well as the increasing need of the control for global pollution, require the conservation of noble metal while enlarge the utilization of laminated metal composite. This thesis is supported by National Science Foundation of China entitled ¡°The solid synthesis of Pt/PtTi(Pt3Ti) block micro-nano laminated material¡±. Pt/PtTi intermetallic compound micro-nano laminated material is obtained by thermal diffusion after the synthesis of Pt/Ti bulk laminated composite. Therefore, the thermal diffusion and rolling deformation of the Pt/Ti laminated composite are investigated in this paper.

In this paper, the technology of thermal diffusion and rolling was carried on to prepare PT/Ti laminated composite. Scanning electron microscope (SEM), X-ray diffraction (XRD), Electron probe microanalysis (EPMA), electronic universal testing machine, etc. were used to characterized the organization structure evolution feature and the mechanic properties of the as-prepared material during thermal diffusion and rolling deformation. The results shown that:

(1) The temperature, pressure and diffusion time were the important parameters that influence the interfacial diffusion of Pt/Ti and the law of the formation of intermetallic compound during thermal diffusion experiment. When the diffused parameter is relative low, the composite slabs all kept continuous, completed, and straight Ti/Ti3Pt/TiPt/Pt layer structure. Pt and Ti were almost consumed entirely under the condition of high temperature and high pressure (1200¡æ£¬20Mpa). The sites of Pt and Ti were replaced by intermetallic compound where a part of residual isle-like Pt inlaying the intermetallic compound. With the increase of temperature, the diffused mode were transformed from Ti unidirectionally diffusing to Pt at low temperature (1000¡æ) to intense interdiffusion at 1200¡æ. The formation of intermetallic compound was effected by the diffusion of Pt and Ti atoms, forming Ti3Pt and then changing to TiPt gradually until the balance occurred. The thickness of the intermetallic compound increased when the temperature was rising up. Keeping other parameters while increasing the pressure or lengthening the diffused time all showed the analogue promoted effect. However, the impact was far lower than temperature. When the pressure was 7Mpa and10Mpa the transformation of the diffused range and the thickness (fluctuate in 1¦Ìm) of intermetallic compound is not obvious. When the pressure was 15Mpa the diffused range and the thickness of intermetallic compound increased a little but not too much (reach at about 2¦Ìm). Keeping other parameters, the transformation of diffused atoms was not evident in the period of 0.5~1h. Nevertheless, When prolonging the time to 2h, the diffusion of atoms near the interface increased dramatically and the thickness of the intermetallic compounds increased as well.
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laminated metal composite is a new kind of material that is made from two or more types of metals possessing different physical, chemical and mechanical prop ...

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