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Casting aluminum alloy shell of the pore

% Of the conditions of temperature, high temperature compression tests. Exponential relationship described alloy during hot deformation in the steady-state flow stress. Dynamic material model was constructed using processing maps,[link widoczny dla zalogowanych], combined with observation results that the deformation temperature of the alloy in the 673K,[link widoczny dla zalogowanych], when the strain rate 1.000SI1 peak efficiency of power dissipation of 0.36, therefore, the temperature in the high strain rate region good processing performance area. To get the best processing performance of a wider range of regional, multi-pass should be used for processing small deformation. Key words Mg-Y_Nd_Gd-zr alloys; flow stress; hot deformation; processing maps CLC TG249.7; TG113 literature flag code A Article ID 1001-2249 (2008) 03-0218-04 magnesium alloy in room temperature plastic deformation is a difficult time, pressure processing of metal materials with poor formability, limiting the deformation of the alloy of magnesium alloys,[link widoczny dla zalogowanych], especially in the industrial application of L1q]. As the plastic processing of magnesium alloys there is a big difficulty, how to determine with reasonable accuracy is a magnesium alloy magnesium alloy processing technology in the field of plastic processing difficulties. Compared with casting magnesium alloy, wrought magnesium alloy products (such as extrusion, rolling, forging) organization is close, less casting defects, greatly improving the mechanical properties [4]. The topics to Mg-Y-Nd-Gd-Zr alloy for the experiment to study the plastic deformation during hot compression true stress-true strain curve, flow stress established by linear regression model and apply the dynamics of a strain material models drawn Processing map for hot working process of magnesium alloy and the thermal deformation of the system to determine the organization provide the basis for prediction. A test pilot for the Mg-2.70Y alloy a 4.90Gd_3.24Nd a 0.46Zr, raw materials, pure magnesium, Mg-Zr master alloy, pure yttrium, neodymium pure, pure Gd, the coverage in the self-flux induction furnace under in the stainless steel crucible prepared from melting. To be completely melted to ensure uniform composition, casting aside a certain time to,[link widoczny dla zalogowanych], /, 92mm × 320mm the mold. Ingot lathe car to do after the outer surface of oxide thermal simulation test. In the box-type resistance furnace and heated to 823K for 6h uniform heat treatment, wire cut into 10mm × 15mm small cylindrical specimen, in GLEEE_15O0 thermal simulation machine on the hot compression test. Compression is applied evenly across the sample lubricant (graphite + oil). Deformation temperature of 523 ~ 723K, the strain rate of 0.002 ~ 1.000S-. . Sample heating rate of 10K / s, the sample before compression in the deformation temperature insulation 3rain, the total deformation of 50%. 2 Results and analysis 2.1 Analysis of stress-strain curves of Mg-Y-Nd-Gd-Zr alloy samples at a strain rate of 0.002S-1 under the conditions of the true stress-true strain curve and the deformation temperature of 723K under the conditions True stress-true strain curve shown in Figure 1. 00.20.40.60.800.20.40.60.81.0 true strain e true strain e (a); = 0.002S a 1 (b) T Figure 1 for a 723K, hot compression true stress-true strain curve can be seen from Figure 1, in different conditions of strain rate and temperature, the alloy flow curve with similar characteristics, cast Mg-Y-Nd- Gd-Zr Alloy during Hot Compression true stress-true strain curve has the typical characteristics of thermal processing: in the initial stage of hardening effect by rising to the highest Received: l1-26 2007 Foundation for a project: the national \projects (2006BAE04B01, 2006BAE04B04) First Author: Zhao Xin,[link widoczny dla zalogowanych], male, born in 1983, master, Beijing General Research Institute for Nonferrous Metals Nonferrous State Key Laboratory of Materials Processing, Beijing (100088), Tel :010-8224l162 -221, E-mail: zhaoxin353 @ sohu. corn (3) small larvae L casting machining man-hours shortened, saving machines and tooling. (4) small larvae L defects in the casting process are: ① consumption of copper material to governor housing, for example, to use each piece of brass 1.5 ~ 1.6kg; ② to add pipe foundry, welding 3 processes and corrosion; ③ corrosion process in a special request to 218 between ventilation; ④ fine surface quality of the inner wall of larvae L could not be observed, need to develop a micro-probe specialized industrial endoscopes. In addition, the corrosion liquid [Cu (NO.):] Should consider recycling to turning waste into treasure, of harm into. (Editor: Li Wan Chung)

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