Dissimilar material joints or multilayered metals have become inevitable in the manufacturing industry due to the increasing demand for multifunctional materials with variable mechanical, thermal, or electrical characteristics in a single assembly. Lattice mismatch of materials at the interface of dissimilar materials leads to inferior mechanical characteristics. In particular, the mismatch in elastic properties indicated by a large initial elastic deformation is critical to determine the extent of variation in stress. However, nanoindentation, the most common and accepted technique to measure elastic modulus, is destructive, time-consuming, and can only examine mechanical properties within a limited area. A non-invasive elastographic mapping technique evaluates the mechanical properties using ultrasonic elastography to study incompressibility. The dissimilar joint between steel and copper was obtained via friction stir welding. The variation of the stress developed at the welded joint of the two different metals was evaluated from the dynamic bulk modulus map. A tensile test of the involved workpiece confirmed a good agreement with our analysis based on the dynamic bulk modulus elastographic mapping results. This study provides a rapid and non-invasive technique for the bulk metallurgic elastic modulus inspection to overcome the limitations of conventional methods.

由于对在单个组件中具有可变机械、热或电特性的多功能材料的需求不断增加，异种材料接头或多层金属在制造业中已成为不可避免。不同材料界面处材料的晶格失配导致较差的机械特性。特别是，由大的初始弹性变形所指示的弹性特性的不匹配对于确定应力变化的程度至关重要。然而，纳米压痕是最常见和公认的测量弹性模量的技术，具有破坏性、耗时，并且只能检查有限区域内的机械性能。一种非侵入性弹性成像技术使用超声弹性成像来评估机械性能，以研究不可压缩性。钢和铜之间的异种接头是通过搅拌摩擦焊获得的。从动态体积模量图评估两种不同金属焊接接头处产生的应力变化。所涉及工件的拉伸试验证实与我们基于动态体积模量弹性成像结果的分析非常吻合。本研究为大块冶金弹性模量检测提供了一种快速、非侵入性的技术，以克服传统方法的局限性。所涉及工件的拉伸试验证实与我们基于动态体积模量弹性成像结果的分析非常吻合。本研究为大块冶金弹性模量检测提供了一种快速、非侵入性的技术，以克服传统方法的局限性。所涉及工件的拉伸试验证实与我们基于动态体积模量弹性成像结果的分析非常吻合。本研究为大块冶金弹性模量检测提供了一种快速、非侵入性的技术，以克服传统方法的局限性。