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Li R.-X.,Shenyang University of Technology | Zhang W.-H.,Shenyang University of Technology | Zhang P.,Shenyang University of Technology | Zhang B.-T.,Shenyang University of Technology | And 2 more authors.
Zhuzao/Foundry | Year: 2016

The influence of electromagnetic stirring on the microstructure, ingredient and refinement of Al-5Ti-B master alloy was studied. The solidification and melting process of purity aluminum after refined by Al-5Ti-B master alloy and differential analysis of Al-5Ti-B master alloy was done at different heating and cooling rates by DSC. The phase transition of TiAl3 and TiB2 was analyzed in the both alloys, and the possible mechanism of grain refining was put forward on this basis. The results indicate that cleanliness of melt is improved well after being electromagnetic stirred for ten minutes at 220 A electricity and TiB2 phase is dispersed in the Al-matrix. The grain of purity aluminum refined by the Al-5Ti-B master alloy is about 390 μm. Al-5Ti-B master alloy appeared peritectic reaction at 2℃/min cooling rate. But there is no peritectic reaction during solidification of purity aluminum after refined by Al-5Ti-B master alloy at the same rate. And there is not peritectic reaction in spite of cooling rate close to balance status when concentration of Ti can not reach 0.15%. That peritectic reaction is determined by the cooling rate and concentration of Ti. © 2016, Chinese Mechanical Engineering Society. All right reserved. Source


Liao C.-W.,Hunan Jinlianxing Special Materials Technology Co. | Chen W.-T.,Hefei University of Technology | Chen H.,Hunan Jinlianxing Special Materials Technology Co. | Fu J.-P.,Development and Reform Commission of Panzhihua City | Pan C.-X.,Wuhan University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2016

The effects of feeding order of K2TiF6 and KBF4 on preparation of Al-Ti-B master alloy by fluoride salt method were discussed from both sides of theoretical calculation and experimental research. The results show that, the feeding order has obvious influence on the phase composition, particle size of TiAl3 and cleanliness of the Al-Ti-B master alloy. Meanwhile, under the conditions of the better refinement performance and higher cleanliness, the use of the process of feeding way with mixed KBF4 and K2TiF6 is the best. The results provide a reference for choosing suitable feeding order to prepare Al-Ti-B master alloy in industry. © 2016, Central South University of Technology. All right reserved. Source


Liao C.-W.,Wuhan University | Chen H.,Hunan Jinlianxing Special Materials Technology Co. | Luo C.-Z.,Wuhan University | Chen J.-C.,Hunan Jinlianxing Special Materials Technology Co. | Pan C.-X.,Wuhan University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2014

The Al-5Ti-1B-10Sr master alloy wire (d 9.5 mm) was prepared by three-stage-feedstock method and hot extrusion process, with pure Al, K2TiF6, KBF4 and Al-20Sr master alloy (mass fraction, %) as raw materials. The wire surface is smooth, and without bubbles, peeling and cracks. The results show that, the Al4Sr phase is in the shape of block with many pores and cracks, and with an average size of 43.2 μm in length and 26.8 μm in width; the Al3Ti phase exhibits granular shapes with an average diameter of 14.4 μm; the TiB2 phase is very fine with an average size of 1.42 μm, and the percent of TiB2 particles with size no larger than 1.97 μm reaches 95.77%. When Al-5Ti-1B-10Sr is added into the Al-13Si alloy, not only the grain size of α(Al) is significantly refined, but also the eutectic Si phase changes from the coarse acicular into fine fibrous or granular. Compared with the untreated Al-13Si alloy, the hardness increases by 43.2% after adding Al-5Ti-1B-10Sr, up to 96.5HB, showing a good performance of both refinement and modification. ©, 2014, Science Press. All right reserved. Source


Qiu Z.,Wuhan University | Li Y.,Hunan Jinlianxing Special Materials Technology Co. | Chen H.,Hunan Jinlianxing Special Materials Technology Co. | Chen J.,Hunan Jinlianxing Special Materials Technology Co. | And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

Effects of Al-10RE master alloy on the microstructure and mechanical properties of as-cast Al-20Si alloy were investigated. The experimental results reveal that the as-casting microstructure of Al-20Si alloy mainly consists of α-Al matrix, primary Si, eutectic Si and acicular Al11RE3 phase with adding Al-10RE master alloy. The morphology of primary Si in the hypereutectic Al-20Si is transformed from bulky to small blocky and globular shape with the increase of the Al-10RE addition. It is found that with addition of 1.5%Al-10RE, the average grain size with dispersive and homogeneous distribution of primary Si can be observed. Meanwhile, the tensile strength, elongation and micro-hardness of as-cast Al-20Si alloy are increases from 98 MPa to 117 MPa, from 9.7% to 11.0%, from 70.93 HV to 87.76 HV, respectively. The RE element can change the growth morphology of primary Si, and fine grain size and generation of acicular Al11RE3 improve greatly the mechanical properties of the alloy. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source

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