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IN-SITU OBSERVATION OF S'PHASE IN Al-Li BASE ALLOY USING TEM SERIAL ROTATION TECHNIQUE
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作者 Zhen Liang Cui Yuexian +1 位作者 Sun Dongli Yang Dezhuang 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 1992年第2期82-87,共6页
An in situ observation of the s'phase morphology and its orientation with the matrix in an Al-Li base alloy was carried out by means of double-tilt rotating around[220]a in a transmission electron microscope(TEM).... An in situ observation of the s'phase morphology and its orientation with the matrix in an Al-Li base alloy was carried out by means of double-tilt rotating around[220]a in a transmission electron microscope(TEM).The results show that the s'phase precipitates in the form of bundles.The units of s'phase are lath-shaped,grow along the<100>,orientation,and have habit planes of{210}*.Many units of the s'phase grow in the same orientation and get together to form a plate-shaped bundle of s'phase laths which lie on the{110}a planes. 展开更多
关键词 Al-Li base alloy s'phase in-situ observation TEM
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PRECIPITATION OF S'PHASE IN AN 8090 Al-Li ALLOY
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作者 Zheng Ziqiao Hori S. 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 1992年第3期77-82,共6页
The precipitation of S'phase in an 8090 Al-Li alloy under various aging conditions was investigated by transmission electron microscopy.The results show that a small quantity of S'precipitates precipitated on ... The precipitation of S'phase in an 8090 Al-Li alloy under various aging conditions was investigated by transmission electron microscopy.The results show that a small quantity of S'precipitates precipitated on the grain and subgrain boundaries for the specimens aged to peak hardness during single aging.Cold working prior to aging promoted the widespread precipitation of S'phase because of increasing dislocation density.In natural aging the vacancies bound by Li atoms were released and formed dislocation loops.S'precipitates preferentially nucleated and grew on the dislocation loops. 展开更多
关键词 Al-Lialloys s'phase aging precipitation
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快速冷冲对喷射成形Al-Cu-Mg合金长片状S'相的演变规律
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作者 范才河 范语楠 +2 位作者 胡泽艺 欧玲 阳建君 《中国有色金属学报》 EI CAS CSCD 北大核心 2020年第7期1544-1551,共8页
采用高分辨透射电镜(TEM)、X射线衍射仪(XRD)、能谱仪(EDS)和硬度测试等手段,研究快速冷冲强变形过程中喷射成形细晶Al-Cu-Mg合金长片状S'相的演变规律。结果表明:挤压态Al-Cu-Mg合金在快速冷冲强变形过程中长片状S'相发生扭曲... 采用高分辨透射电镜(TEM)、X射线衍射仪(XRD)、能谱仪(EDS)和硬度测试等手段,研究快速冷冲强变形过程中喷射成形细晶Al-Cu-Mg合金长片状S'相的演变规律。结果表明:挤压态Al-Cu-Mg合金在快速冷冲强变形过程中长片状S'相发生扭曲、脆断、回溶和缩颈,长片状S'相的形貌、尺寸、分布及与基体的取向关系发生显著变化,从有规律分布的长片状纳米析出相演变为无规律分布的短棒状S'相和弥散分布的颗粒状再析出相。长片状S'相的扭曲和脆断,显著增大析出相与铝基体的接触面,提高了析出相与铝基体的界面畸变能,促进了S'相的回溶,导致铝基体重新达到过饱和状态,从而发生再析出以降低基体自由能。挤压态Al-Cu-Mg合金在快速冷冲过程中合金硬度显著增加,由53HB增加到127HB,升高139.6%。 展开更多
关键词 AL-CU-MG合金 快速冷冲 S'相 破断 回溶
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