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Study on the Fabrication of Al-P Master Alloys by Powder Metallurgy

Author: HuXiaoLin
Tutor: LiuXiangFa
School: Shandong University
Course: Materials Processing Engineering
Keywords: Master alloy of Al-P system Powder Metallurgy AlP Al-Si alloy
CLC: TF125
Type: Master's thesis
Year: 2008
Downloads: 149
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Abstract


In order to solve the cast prepared by the Department of Al-P master alloy phosphorus content AlP coarse particles were clusters like distribution, new technology master alloy prepared by powder metallurgy Al-P Department. Using optical microscopy (OM) and electron probe micro-component analysis (EPMA), by means of the middle of the Department of Al-P alloy prepared by powder metallurgy microstructure, the modification effect of the master alloys were examined. The main process is prepared by powder metallurgy of the middle of the Al-P-based alloy powder and aluminum powder ingredients of a high-phosphorus alloy (Cu-40Si-20P, Si-20Mn-20P, and Cu-P) - Mix - compacts - sintering 500-660 ℃ temperature conditions, the diffusion reaction occurs. High phosphorus alloy / Al thermal diffusion even in AlP formation and diffusion behavior found in the lower diffusion temperature (500 ℃), AlP precipitation in the high-phosphorus alloy / Al interface at. AlP was fine dispersion of Cu-8P master alloy with aluminum reaction; AlP was the middle of the Cu-14P alloy aluminum reacts massive distribution: Cu-40Si-20P ternary alloy aluminum reacts AlP interface Department showed that the distribution of small pieces. On this basis, the system to study the new technology of powder metallurgy prepared by the Department of Al-P master alloy: high phosphorus alloy powder particle size, forming pressure, sintering temperature, sintering time and the vacuum degree of the impact on the the resulting the AlP morphology and distribution. The results show that: (1) the molding pressure is too small, the high porosity of the test block, the sintering process is the oxidative expansion; molding pressure is too large, after sintering, a melt of Al-Si alloy test piece not melt. (2) particle size of the high-phosphorus alloy powder, and the reaction to generate AlP particle the larger range was Clusters shape; small particle size of the high-phosphorus alloy powder generated ALP smaller particles, but also showed a dispersion-like distribution. (3) the higher the sintering temperature (below the melting temperature of the test piece), and and complete reaction shorter the time required; longer sintering time, the reaction more sufficiently, the primary silicon precipitates in the matrix can be seen. (4) the degree of vacuum is low, severe oxidation of the test block, the oxide film is formed so that the test pieces added to the melt is not easy to melt. Determine the optimal parameters prepared by powder metallurgy department of Al-P master alloy: high-phosphorus alloy powder particle size of 50 to 75 μm; pressure of 10 MPa; sintering temperature of 650 ° C; sintering time 40min. This process of preparation of the Department of Al-P master alloy phosphorus content can reach 10%. Compared with the cast prepared by the Department of Al-P master alloy, Al-P-based master alloys prepared by powder metallurgy AlP particle size and uniform distribution, the advantages of the phosphorus content. Added the same amount of phosphorus, and cast the legal system modification effect of Al-Si alloy prepared by the Department of Al-P master alloy modification effect considerable deterioration time shortened by nearly a third.

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