Mg-9Zn-XAl合金半固态成形的热力学分析及实验研究（英文）
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摘要
采用相图计算软件Pandat计算了Mg-9Zn-XAl(X=2,4,6,质量分数,%)合金的凝固温度窗口、固相率对温度的敏感性、加工温度窗口和相组成及其转变路径,并进行了实验验证。结果表明:Mg-9Zn-XAl镁合金的半固态加工温度窗口较大,易于进行半固态成形操作,且在半固态加工温度区间,其固相率对温度的敏感性均小于0.015。当Al含量不同时,其相的转变温度和路径不同。Mg-9Zn-XAl在凝固过程中均形成α-Mg、Mg Zn,Mg_(32)(Al,Zn)_(49)和Al_5Mg_(11)Zn_4相,当Al含量增加至6%时,形成了Mg_(17)Al_(12)相。自孕育流变成形Mg-9Zn-XAl合金的晶粒尺寸和圆整度分别为65.3、56.5、52.2μm和1.3、1.19、1.23。当加工温度为150℃时,其抗压强度和压缩变形量分别为278、283、295 MPa和36.22%、33.02%、31.21%。
Solidification temperature range,temperature sensitivity of the solid fraction,temperature process window and phase composition and transformation path of Mg-9Zn-XAl(X=2,4,6,wt%)alloys were calculated by Pandat calculation,and studied by experiment.The results indicate that a larger temperature window is conducive to the control and operation of semi-solid forming for the Mg-9Zn-XAl alloy.The temperature sensitivity of all solid fractions is smaller than 0.015.Mg-9Zn-XAl alloys have different transformation temperatures and paths of the phase at different Al additions.α-Mg,Mg Zn,Mg_(32)(Al,Zn)_(49) and Al_5Mg_(11)Zn_4 are formed in all samples.When Al addition is increased to 6%,Mg_(17)Al_(12) phase is formed.The grain size and roundness of Mg-9Zn-XAl alloys prepared by self-inoculation rheo-diecasting method are 65.3,56.5,52.2μm and 1.3,1.19,1.23,respectively.When the working temperature is 150°C,the comprehensive strength and deformation are 278,283,295 MPa and 36.22%,33.02%,31.21%,respectively.
Solidification temperature range,temperature sensitivity of the solid fraction,temperature process window and phase composition and transformation path of Mg-9Zn-XAl(X=2,4,6,wt%)alloys were calculated by Pandat calculation,and studied by experiment.The results indicate that a larger temperature window is conducive to the control and operation of semi-solid forming for the Mg-9Zn-XAl alloy.The temperature sensitivity of all solid fractions is smaller than 0.015.Mg-9Zn-XAl alloys have different transformation temperatures and paths of the phase at different Al additions.α-Mg,Mg Zn,Mg_(32)(Al,Zn)_(49) and Al_5Mg_(11)Zn_4 are formed in all samples.When Al addition is increased to 6%,Mg_(17)Al_(12) phase is formed.The grain size and roundness of Mg-9Zn-XAl alloys prepared by self-inoculation rheo-diecasting method are 65.3,56.5,52.2μm and 1.3,1.19,1.23,respectively.When the working temperature is 150°C,the comprehensive strength and deformation are 278,283,295 MPa and 36.22%,33.02%,31.21%,respectively.
引文
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2 Hu Y,Rao L,Li Q P et al.Rare Metal Materials and Engineering[J],2016,45(2):493(in Chinese)
3 Zhou B,Kang Y L,Qi M F et al.Journal of Materials Engineering[J],2014,42(10):1(in Chinese)
4 Wan X F,Ni H J,Huang M Y et al.Transactions of Nonferrous Metals Society of China[J],2013,23(4):896
5 Chen Y A,Gao J J,Yu S et al.Materials Science&Engineering A[J],2016,671:127
6 Feng K,Huang X F,Ma Y et al.The Chinese Journal Nonferrous Metals[J],2011,21(9):2035(in Chinese)
7 Mile B Djurdjecvic,Rainer Schmid-Fetzer.Materials Science and Engineering A[J],2006,417(1-2):24
8 Agnew S R,Nie J F.Scripta Materialia[J],2010,63(7):671
9 Maciel C A,Atkinson H V,Kapranos P.Acta Materialia[J],2003,51(8):2319
10 Liu D,Atkinson H V,Jones H.Acta Materialia[J],2005,53(14):3807
11 Li Y D,Apelian D,Xing B et al.Transactions of Nonferrous Metals Society of China[J],2010,20(9):1572
12 Gr?bner J,Kozlov A,Fang X F et al.Acta Materialia[J],2015,90:400
13 Liu J T,Zhang Y A,Li X W et al.Transactions of Nonferrous Metals Society of China[J],2014,24(5):1481
14 Xia X Y,Sanaty-Zadeh A,Zhang C et al.Journal of Alloys and Compounds[J],2014,593:71
15 Chen S L,Daniel S,Zhang F et al.Calphad[J],2002,26(2):175
16 Pola A,Roberti R,Bertoli E et al.Proceedings of the 9th S2PAdvanced Semi-Solid Processing of Alloys and Composities[C].Busan:Trans Tech Publications LTD,2006:58
17 Gottardi G,Pola A,La Vecchia G M.La Metallurgia Italiana[J],2015(5):11
18 Anynwu L A,Kamado S,Honda T.Materials Science Forum[J],2000,350-351:73
19 Xing B,Li Y D,Feng J Y et al.Metals[J],2016,6(3):69
20 Wang C J,Jin Q L,Zhou R et al.Rare Metal Materials and Engineering[J],2010,39(S1):208(in Chinese)