Additive manufacturing is a revolutionary technology that offers a different pathway for material processing and design. However, innovations in either new materials or new processing technologies can seldom be successful without a synergistic combination. We demonstrate an in situ design approach to make alloys spatially modulated in concentration by using laser-powder bed fusion. We show that the partial homogenization of two dissimilar alloy melts—Ti-6Al-4V and a small amount of 316L stainless steel—allows us to produce micrometer-scale concentration modulations of the elements that are contained in 316L in the Ti-6Al-4V matrix. The corresponding phase stability modulation creates a fine scale–modulated β + α′ dual-phase microstructure that exhibits a progressive transformation-induced plasticity effect, which leads to a high tensile strength of ~1.3 gigapascals with a uniform elongation of ~9% and an excellent work-hardening capacity of >300 megapascals. This approach creates a pathway for concentration-modulated heterogeneous alloy design for structural and functional applications.

中文翻译：

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通过增材制造原位设计具有浓度调制的先进钛合金

增材制造是一项革命性技术，为材料加工和设计提供了不同的途径。然而，如果没有协同作用，新材料或新加工技术的创新很少能成功。我们展示了一种原位设计方法，通过使用激光-粉末床融合使合金的浓度进行空间调制。我们表明，两种不同合金熔体（Ti-6Al-4V 和少量 316L 不锈钢）的部分均质化使我们能够对 Ti-6Al-4V 中 316L 中所含的元素进行微米级浓度调制矩阵。相应的相稳定性调制产生精细尺度调制的β+α'双相微观结构，表现出渐进相变诱导的塑性效应，这导致约 1.3 吉帕斯卡的高抗拉强度和约 9% 的均匀伸长率和 > 300 兆帕斯卡的出色加工硬化能力。这种方法为结构和功能应用的浓度调制异质合金设计创造了一条途径。