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7055 aluminum alloy chemical composition, phase composition and performance characteristics

a laboratory that the grain can cause internal corrosion erosion; Goard also mentioned, in the intergranular corrosion is not sensitive to the A1 material found in erosion. So another part of the scholars believe that exfoliation corrosion is stress corrosion. AI alloy in the process of precipitation hardening, and its decomposition with the solution determines the sensitivity to erosion, in addition, material sensitivity to stress is an important factor of erosion. Acoustic emission method can be used to study erosion, denudation of the incubation period and the determination of the initiation location. The erosion of aging on A1 alloys have a great impact. Limitation of natural aging and over the erosion of Al alloy is less sensitive, while the highest peak of the sensitivity of the erosion of time. The reason is that when the peak time,[link widoczny dla zalogowanych], s-phase (CuAI, Mg) showed a continuous network in the grain boundary structure of precipitation. In the appropriate medium, S phase of cu as a cathode, S phase of the Mg, A1 and the grain boundaries depleted Cu, Al depleted zone alternately as a Mg anode electrochemical corrosion, the formation is very sensitive to the activity of channels along the corrosion grain boundaries, and stress corrosion products,[link widoczny dla zalogowanych], the formation of erosion layer. The corrosion process can be formed from the casting s phase and pure battery galvanic current time curve measurement and composition analysis of solution after corrosion was confirmed. Grain structure and orientation by influencing the degree of decomposition of solid solution, continuous segregation of alloy components, metal compounds form asks its enrichment at the grain boundary, so as microstructure and internal stress caused by the change, the erosion occurrence, extending to create different conditions. ... Impact of these factors are often pitting, intergranular corrosion and stress corrosion of the important factors. AI, the hardness and electrical conductivity properties of the alloy, respectively, reflecting the strength and stress corrosion resistance. Enhanced heat treatment of high strength A1 alloys mainly through the aging treatment to obtain high dispersion of the precipitate to achieve. Conductivity reflects the alloy stress corrosion parameter, the higher the conductivity, resistance to stress corrosion better H ¨. The hardness and conductivity 7055 aluminum alloy in Table 2.4 Conclusion of the Comprehensive excellent performance of 7055 aluminum alloy. 7055 aluminum alloy in the chemical composition and content of the decision of the GP, 'off the table the limitation of 27,055 aluminum three hardness and electrical conductivity Prescription hardness / HB conductivity / MS · m transition phase, 11 equilibrium phase size, number and distribution, thereby affecting the performance of alloys. Matrix precipitates (MPt), grain boundary precipitates (GBP) and the width of intergranular precipitate free (PFZ) of the shape and characteristics determine the macroscopic properties of the alloy. References: [1] Qin Feng-Xiang, Zhang Jinbao, has plum light. 7055 Super aging hardening characteristics of aluminum and stress properties [J]. Light Alloy Fabrication Technology, 2001,10:36. [2] Liu Sheng lamps,[link widoczny dla zalogowanych], Zhang Xinming, Huang Po. Quench sensitivity of 7055 aluminum alloy [J]. Central South University (Natural Science) ,2006,10:846-848. [3] SCI, Li Di, Guo Baolan. 7 × × × series of stress corrosion cracking of aluminum alloy [J]. Corrosion Science and Protection Technology, 2001,13 (4) :218-222. [4] LendvaiJ. PrecipitationandStrengtheninginAluminumAlloyslJJ. MaterialsScienceForum ,1996,217-222 :43-56. [5] Google also Jie, Li Yongxia, Zhang Yonggang, et al. RRA 7050 precipitated alloy TEM study [J]. Of Aeronautical Materials, 2000,20 (4) :1-7. [6] on properties and Wei Liu, John Liu of. Strengthening solution on the 7055 aluminum alloy mechanical properties and fracture behavior [J]. Central South University of Technology (Natural Science), 2000,[link widoczny dla zalogowanych],31 (6) :528-531. [7] ZHENG Zi Qiao, Li Hongying, Mo Zhi-min. RRA a 7055 type aluminum alloy processing [J]. Chinese Journal of Nonferrous Metals, 2001, l1 (5) :771-776. [8] Yu, Yin Zhimin. Ultra High Strength Aluminium Research and Development [J]. Central South University of Technology, 2002,[link widoczny dla zalogowanych],33 (6): 592.596. [9] WANG Zhu-tang, Tianrong Zhang. Aluminum alloy and its processing manual [M]. Changsha: Central South University Press, 1989. [1O] Zhou Hongzhang. Advances in high strength aluminum alloy [J]. Rare Metal Materials and Engineering, 2001,30 (6) :87-92. [11] Li Jie. Alloy Heat Treatment on the 7055 performance of [D]. Changsha: Central South University, 2005.

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