For almost a century commercial aluminum alloys were developed and optimized for high performance in a specific and narrow range of application, which commonly coincides with their industrial classification. Overcoming the limitations associated with the modern lightweighting concept requires new alloy design strategies that offer an expanded property portfolio with a better trade-off between formability and achievable strength. The associated materials would be key to circumventing the need for a multi material mix that diminishes the recyclability of the final product. This review summarizes current knowledge about a new class of materials, “crossover alloys”, that combine advantageous properties normally limited to certain classes of commercial aluminum alloys. It focuses on the crossover alloys AlMg/AlCuMg (5xxx/2xxx) and AlMg/AlZnMg(Cu) (5xxx/7xxx). Recently available research data provides indications for superior formability with simultaneously high age-hardening potential, which may pave the way for broader industrial application in the foreseeable future. Because these new alloys exhibit Mg as their major constituent but are – in contrast to commercial AlMg alloys – age hardenable, they do not fit into the current alloy classification scheme. This review formalizes crossover alloys as a potential new aluminum alloy class which features an innovative alloy design methodology.

近一个世纪以来，商业铝合金被开发和优化以在特定和狭窄的应用范围内实现高性能，这通常与其工业分类相吻合。克服与现代轻量化概念相关的限制需要新的合金设计策略，以提供扩展的属性组合，并在可成形性和可实现的强度之间进行更好的权衡。相关材料将是避免对降低最终产品可回收性的多材料混合需求的关键。这篇综述总结了当前关于一类新材料“交叉合金”的知识，这些材料结合了通常仅限于某些类别的商用铝合金的有利特性。它侧重于交叉合金 AlMg/AlCuMg (5xxx/2xxx) 和 AlMg/AlZnMg(Cu) (5xxx/7xxx)。最近可用的研究数据表明具有优异的成形性和高时效硬化潜力，这可能为在可预见的未来更广泛的工业应用铺平道路。由于这些新合金的主要成分是镁，但与商业铝镁合金相比，它们具有时效硬化性，因此它们不适合当前的合金分类方案。这篇综述将交叉合金正式化为一种潜在的新型铝合金，其特点是采用了创新的合金设计方法。由于这些新合金的主要成分是镁，但与商业铝镁合金相比，它们具有时效硬化性，因此它们不适合当前的合金分类方案。这篇综述将交叉合金正式化为一种潜在的新型铝合金，其特点是采用了创新的合金设计方法。由于这些新合金的主要成分是镁，但与商业铝镁合金相比，它们具有时效硬化性，因此它们不适合当前的合金分类方案。这篇综述将交叉合金正式化为一种潜在的新型铝合金，其特点是采用了创新的合金设计方法。