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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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铸造铝合金微观组织对应变硬化指数预测的影响
DOI: 10.3724/SP.J.1037.2009.00474, PP. 184-188
Keywords: 铸造铝合金,应变硬化指数,微结构硬化能力参数,微观组织
Abstract:
研究了铸造铝合金的微观组织参数包括二次枝晶臂间距(SDAS)、Si颗粒的形貌率和体积分数,与拉伸过程中内应力的关系,根据Hollomon和内应力公式建立了应变硬化指数n的定量预测关系式.结果表明n值反映了材料在较大塑性变形下(在发生塑性松弛以后)的硬化能力.定义了微结构硬化能力参数,并用常见的几种铸造铝合金材料进行了验证.所推导的理论关系式及线性拟合关系式能较好地预测n值,对同一牌号的铸造铝合金材料,n值对颗粒相形貌率和SDAS的依赖性强,而对颗粒相体积分数的依赖性不明显,颗粒相形貌率和SDAS值越大,n值越小.对A319和A356/357铝合金,最佳修正系数分别是0.17和0.11,预测平均误差在10%左右.
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