High Strain Rate Superplasticity in an Al-Li-Mg Alloy Subjected to Equal-Channel Angular Extrusion
High Strain Rate Superplasticity in an Al-Li-Mg Alloy Subjected to Equal-Channel Angular Extrusion
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等通道角挤压铝锂镁合金的高应变率超塑性
DOI：
10.2320/matertrans.43.2370
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
G. Itoh
中科院分区：
文献类型：
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作者：
F. Musin;R. Kaibyshev;Y. Motohashi;T. Sakuma;G. Itoh
研究了Al - 4.1% mg - 2.0% li - 0.16% sc - 0.07% zr合金（1421 Al）在温度范围为250 ~ 450◦C、应变速率为1.4 × 10−5 ~ 1.4 s−1的等通道角挤压（ECAE）强塑性应变下的超塑性行为。ECAE后的晶粒尺寸约为0.8µm，高角度晶界的比例约为80%，在温度为400◦C，初始应变速率为1.4 × 10−2 s−1，应变速率敏感系数为0.6时，达到了1850%的最高伸长率。结果表明，ECAE处理后的1421 Al在300-450◦C温度范围内表现出优异的超塑性性能，应变率灵敏度高于0.4。研究了高应变速率超塑性变形过程中的组织演变和空化现象。
The superplastic behavior of an Al–4.1%Mg–2.0%Li–0.16%Sc–0.07%Zr alloy (1421 Al) subjected to intense plastic straining by equalchannel angular extrusion (ECAE) was studied in the temperature interval 250–450 ◦ C at strain rates ranging from 1.4 × 10 −5 to 1.4 s −1 . The grain size after ECAE was about 0.8 µm and the fraction of high angle boundaries was about 80 pct. The highest elongation of 1850% without failure appeared at a temperature of 400 ◦ C and initial strain rate of 1.4 × 10 −2 s −1 with corresponding coefficient of the strain rate sensitivity of 0.6. It was shown that the ECAE processed 1421 Al exhibits superior superplastic properties in the temperature range 300–450 ◦ C with the strain rate sensitivity higher than 0.4. Microstructural evolution and cavitation during high strain rate superplastic deformation were examined .