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首页> 外文期刊>Transactions of the American Foundrymen's Society >Thixocasting and low-pressure/counter-pressure diecasting: processes for production of high-quality casting of Al-alloys
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Thixocasting and low-pressure/counter-pressure diecasting: processes for production of high-quality casting of Al-alloys

机译：触变铸造和低压/反压铸件：铝合金优质铸件的生产工艺

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摘要

Thixocasting of semi-solid Al-alloys, as well as low-pressure and counter-pressure diecasting of selectively ceramic reinforced aluminum, i.e., with gradient microstructure, belong to the group of innovative process and materials combinations. Incompetition with various manufacturing processes, they are opening up new possibilities for the production of cast parts. This paper reports on both basic and application-related research on these processes and contains and assessment of their potential.In the field of thixocasting, an analytical process, based on a conventional penetration testing method, has been used to investigate the flow behavior in the semi-solid state. The experiments show that a basic change in the consistency of the semisolidmetallic material occurs within the relevant temperatures for thixoforming. The microstructure and properties of a thixocast rib-structured part have been investigated by processing the A357 alloy and the high-strength AMZ 62 alloy. An analysis of theflow behavior during the filling was carried out by means of step-shooting experiments.In the field of low-pressure/counter-pressure diecasting, a hollow half-sphere type casting was chosen to investigate the influence of process parameters. For the selectively reinforced casting, a good infiltration of the preforms, on the one hand, andadequate quality in the non-reinforced areas, on the other hand, were achieved. The influence of the different parameters, like die temperature and pressure difference during filling and solidification, on the properties and the porosity was shown.
机译：半固态铝合金的触变铸造以及选择性陶瓷增强铝的低压和反压压铸（即具有梯度微结构）属于创新的工艺和材料组合。与各种制造工艺竞争，它们为铸造零件的生产开辟了新的可能性。本文就这些过程进行了基础研究和与应用有关的研究报告，并对其潜力进行了评估。半固态。实验表明，在触变成形的相关温度范围内，半固态金属材料的稠度发生了基本变化。通过处理A357合金和高强度AMZ 62合金，研究了触变肋结构零件的组织和性能。通过分步实验对填充过程中的流动行为进行了分析。在低压/反压压铸领域，选择了空心半球形铸件来研究工艺参数的影响。对于选择性增强的铸件，一方面实现了预成型件的良好渗透，另一方面实现了在非增强区域中的足够的质量。显示了不同参数（如模头温度和填充和凝固过程中的压差）对性能和孔隙率的影响。

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