Modified instability condition for identification of unstable metal flow regions in processing maps of magnesium alloys
Modified instability condition for identification of unstable metal flow regions in processing maps of magnesium alloys
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DOI：
10.1179/174328405x47519
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发表时间：
2005-08-01
影响因子：
1.8
通讯作者：
Rao, BN
中科院分区：
文献类型：
--
作者：
Babu, NS;Tiwari, SB;Rao, BN
为了根据流动应力数据开发各种镁合金的加工图，基于应用于大塑性流动的齐格勒连续介质原理的简单不稳定条件被扩展，以描绘不稳定金属流动或断裂或缺陷发生的区域。将测得的流动应力数据拟合到本构方程中。通过与各种镁合金变形压缩样本报告的微观结构观察结果进行比较，检验了所开发的加工图的适用性。根据应变率敏感性指数的最大值，建议材料的最佳热加工条件。
For the development of processing maps for various magnesium alloys from the flow stress data, a simple instability condition based on Ziegler's continuum principles as applied to large plastic flow is extended to delineate the regions of unstable metal flow or the occurrence of fractures or defects. The measured flow stress data is fitted to a constitutive equation. The applicability of the processing maps developed has been examined by comparing with reported microstructural observations of deformed compression specimens of various magnesium alloys. Optimum hot working conditions for the material are suggested, based on the maximum values of the strain rate sensitivity index.