| Formation and crystallization of bulk Pd_(82)Si_(18) amorphous alloys |
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| 作者姓名： | 蒲建 王敬丰 肖建中 崔昆 |
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| 作者单位： | State Key Lab of Plastic forming Simulation and Die & Mould Technology Huazhong University of Science & Technology，Wuhan 430074，China，State Key Lab of Plastic forming Simulation and Die & Mould Technology Huazhong University of Science & Technology，Wuhan 430074，China，State Key Lab of Plastic forming Simulation and Die & Mould Technology Huazhong University of Science & Technology，Wuhan 430074，China，State Key Lab of Plastic forming Simulation and Die & Mould Technology Huazhong University of Science & Technology，Wuhan 430074，China |
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| 摘 要： | 1 INTRODUCTIONMetallicglassisregardedasastatethatisofdis orderunlikecrystalalloyswith periodicatomstruc ture.Soitshowsexcellentcapabilitiesofsoftmag netism ,mechanics ,corrosionresistance ,etc .How ever ,mostofamorphousalloyswereproducedbyus ingrapidsolidificationmethodssuchassplatquench ing ,meltspinning ,andsoon ,withcharacteristiccoolingratesof 10 4 10 6 K/s .Becauseamorphousal loysarepreparedwithsilk ,powderandribbon ,itisgreatlylimitedinengineeringapplication .Recently ,severalbulk…
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Formation and crystallization of bulk Pd82Si18 amorphous alloys |
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| PU Jian,WANG Jian feng,XIAO Jian zhong,CUI Kun.Formation and crystallization of bulk Pd_(82)Si_(18) amorphous alloys[J].Transactions of Nonferrous Metals Society of China,2003,13(5). |
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| Authors: | PU Jian WANG Jian feng XIAO Jian zhong CUI Kun |
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| Abstract: | Bulk amorphous Pd82Si18 alloy with the largest diameter of 8 mm was prepared by water quenching the molten alloy with flux medium in a quartz tube. The calculation result indicates that the bulk Pd82Si18 amorphous alloys have a low critical cooling rate (Rc) of 4.589 K/s or less. The experimental results show that purifying melt may improve glass forming ability(GFA) of undercooled melt, while liquid phase separation (LPS) of undercooled melt will decrease its GFA. There are some differences in crystallization experiments between bulk metallic glass and amorphous ribbons of Pd82Si18 alloys. These include the numbers of exothermic peak, glass transition temperature Tg, crystallization temperature Tx, region of undercooling liquid (ΔT=Tx-Tg) respectively. The links of cooling rates of melt and crystallization of Pd82Si18 amorphous alloys are explored. |
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| Keywords: | bulk amorphous alloys Pd 82 Si 18 glass forming ability undercooling critical cooling rate |
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