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首页> 外文期刊>Journal of Materials Engineering and Performance >Identification of heat treatments for better formability in an aluminum-lithium alloy sheet
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Identification of heat treatments for better formability in an aluminum-lithium alloy sheet

机译：确定用于改善铝锂合金薄板成形性的热处理

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Research in the weight of an automobile is a continuous process among auto manufacturers. The “body in white” (BIW, i.e., the body of the car) deserves attention, being a major contributor to the weight of the vehicle. By virtue of a high strength to weight ratio (density smaller than aluminum) and a higher Young’s modulus than aluminum, aluminum-lithium alloy sheet appears to hold promise as an autobody material. Because auto components are required in large numbers and are formed at room temperature, formability under these conditions becomes significant. Aluminum-lithium alloys acquire, because of aging over a short period of time, a good amount of strength and hence dent resistance. In principle, they can be given, through suitable heat treatments, a high formability as well as dent resistance, i.e., an ideal combination of properties. To this end, tensile properties have been determined for a number of heat treatments comprising three different solutionizing temperatures and for three aging times at each of the three aging temperatures. Considerable influence of heat treatment was observed on the mechanical properties (which in turn characterize both formability and dent resistance), such as the strain hardening exponent, average normal anisotropy, yield stress, ultimate tensile stress, and percentage elongation to failure. For each property, the best three heat treatments leading to a high formability were identified. Consequently, heat treatments that imparted the greatest formability for processes such as deep drawing and stretch forming have been identified. The investigations show that the best heat treatment for one property may not be the best for another property, calling for a compromise to obtain the most practicable heat treatment schedule. Results shed light on not only the biaxial formability but also springback behavior that is important in the BIW components. Further, the properties obtained from the heat treatment giving good formability in deep drawing were used to simulate car body fender and the S-rail using sheet metal forming simulation software PAMSTAMP2G. A comparison of simulation of aluminum-lithium alloy fender and S-rail with those made from steel demonstrates advantages using aluminum-lithium alloys in terms of weight reduction. Finally, based on the current oil prices and the projected demand for oil in the next decade, aluminum-lithium alloys seem to have an edge despite the difficulties in manufacturing, assembly, and joining of the aluminum-lithium components.
机译：在汽车制造商中，对汽车重量的研究是一个连续的过程。 “白车身”（BIW，即汽车的车身）值得关注，它是车辆重量的主要贡献者。由于高强度重量比（密度小于铝）和比铝更高的杨氏模量，铝锂合金薄板有望作为汽车车身材料。由于大量需要汽车部件并且在室温下形成，因此在这些条件下的可成型性变得很重要。铝锂合金由于在短时间内的老化而获得了良好的强度，因此也获得了抗凹痕性。原则上，可以通过适当的热处理赋予它们高的可成形性以及抗凹陷性，即性能的理想组合。为此，已经针对包括三个不同固溶温度的多种热处理以及在三个时效温度中的每个时效中的三个时效时间确定了拉伸性能。观察到热处理对机械性能（反过来又表征了可成形性和抗凹痕性）的显着影响，例如应变硬化指数，平均法向各向异性，屈服应力，极限拉伸应力和断裂伸长率。对于每种性能，确定了导致高可成型性的最佳三种热处理。因此，已经确定了对诸如深冲和拉伸成形的过程赋予最大可成形性的热处理。调查显示，针对一个属性的最佳热处理可能并非针对另一个属性的最佳热处理，因此需要妥协才能获得最可行的热处理时间表。结果不仅阐明了双轴可成形性，还阐明了在BIW组件中重要的回弹行为。此外，通过热处理获得的性能在深冲中具有良好的可成型性，并使用钣金成形模拟软件PAMSTAMP2G来模拟车身护舷和S形导轨。铝锂合金护舷和S型钢轨与钢制仿真的比较表明，使用铝锂合金在减轻重量方面具有优势。最后，根据当前的油价和未来十年对石油的预计需求，尽管铝锂组件的制造，组装和连接有困难，但铝锂合金似乎仍具有优势。

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