STATISTICAL DISTRIBUTIONS OF FRACTURE STRENGTHS OF CAST AL-7SI-MG ALLOY
STATISTICAL DISTRIBUTIONS OF FRACTURE STRENGTHS OF CAST AL-7SI-MG ALLOY
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DOI：
10.1016/0921-5093(93)90226-5
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发表时间：
1993-12-20
期刊：
影响因子：
6.4
通讯作者：
CAMPBELL, J
中科院分区：
文献类型：
--
作者：
GREEN, NR;CAMPBELL, J
采用过滤金属在干砂模中通过顶部填充（TF）、湍流底部填充（TBF）和无湍流底部填充（TFBF）生产Al-7Si-Mg合金立式铸造试棒。在拉伸测试之前对测试棒进行热处理。对抛光部分的扫描电子显微镜检查表明，所有测试棒均含有氧化膜的缠结网络，这些氧化膜网络构成了金属内的裂纹。它们在 TF 和 TBF 铸件中更为普遍。在所有断裂表面上都观察到大量异常特征。这些是填充过程中产生并夹带在铸件中的氧化膜。用威布尔分布获得了对每组铸件抗拉强度偏斜分布的最佳描述。 TF、TBF 和 TFBF 铸件的威布尔斜率分别为 11、20 和 38。
Al-7Si-Mg alloy vertically cast test bars were produced in dry sand moulds by top filling (TF), turbulent bottom filling (TBF) and turbulence-free bottom filling (TFBF) with filtered metal. The test bars were heat treated prior to tensile testing. Scanning electron microscopy examination of polished sections showed that all the test bars contained tangled networks of oxide films which are seen to constitute cracks within the metal. They are more prevalent in the TF and TBF castings. A large number of anomalous features are observed on all fracture surfaces. These are oxide films produced during filling and entrained in the casting. The best description of the skewed distributions of tensile strengths of each set of castings was obtained with the Weibull distribution. Weibull slopes of 11, 20 and 38 were obtained for the TF, TBF and TFBF castings respectively.