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| 1 | 人工时效条件对重力铸造B356铝合金力学性能的影响(英文)显示文摘采用差示扫描热量法(DSC)、硬度测试和拉伸试验研究重力铸造B356铝合金的时效硬化行为。人工时效温度分别为155、165和180°C,热处理时间为40 min^32 h。DSC结果表明,样品在低于室温的条件下(约为-10°C)形成团簇。由于团簇形成影响主要强化相β′′的后续沉淀过程,因此可以推断,固溶处理后不及时进行人工时效处理将对合金的力学性能产生不利影响。同时证实,在人工时效过程中(分别在155°C时效16 h,165°C时效6 h和180°C时效4 h)当β′′相生成完全后,合金的硬度和拉伸强度达到最大。经最高时效温度处理的样品其力学性能随时效时间的延长而降低,这与共格β′′相向半共格β′相的转变相关。最后计算得到与β′′相沉淀相关的活化能为57.2 k J/mol。 | D.DIONI S.CECCHEL G.CORNACCHIA M.FACCOLI A.PANVINI | 2015 | Transactions of Nonferrous Metals Society of China2015，25，4： | 4 |
| 2 | Pre-aging on early-age behavior and bake hardening response of an Al-0.90Mg-0.80Si-0.64Zn-0.23Cu alloy显示文摘Pre-aging on early-age behavior and bake hardening response of an Al-0.90Mg-0.80Si-0.64 Zn alloy was investigated by differential scanning calorimetry(DSC), high resolution transmission electron microscopy(HRTEM), 3-dimensional atom probe(3DAP), Erichsen test and tensile test. The results indicated that pre-aged alloy exhibited excellent formability and bake-hardening response, while bake hardening response was poor in samples with natural aging. Clustering behavior during natural aging was inhibited by pre-aging. Numerous GP zones formed in pre-aged samples. GP zones were the nuclei of β′′ precipitates or directly transformed β′′ phases during paint baking process. A large number of β′′ phases were observed in pre-aged samples after paint bake treatment. There was no sign to indicate that β′′phase precipitated in natural aged samples after bake hardening treatment. | Lizhen Yan Zhihui Li Yong-an Zhang Baiqing Xiong Xiwu Li Hongwei Liu Shuhui Huang Hongwei Yan | 2016 | Progress in Natural Science:Materials International2016，26，4： | 4 |
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