Nanostructured high-strength molybdenum alloys with unprecedented tensile ductility
Nanostructured high-strength molybdenum alloys with unprecedented tensile ductility
复制标题
具有前所未有的拉伸延展性的纳米结构高强度钼合金
DOI：
10.1038/nmat3544
复制
发表时间：
2013-04-01
期刊：
影响因子：
41.2
通讯作者：
Ma, E.
中科院分区：
文献类型：
--
作者：
Liu, G.;Zhang, G. J.;Ma, E.
难熔钼合金的高温稳定性和机械性能对于广泛的关键应用来说是非常理想的。然而，这些合金的一个长期存在的问题是它们具有低延展性和有限的可成形性。在这里，我们报告了一种纳米结构化策略，实现钼合金的屈服强度超过800 MPa和拉伸伸长率大到类似于40%，在室温下。该工艺路线涉及分子水平的液-液混合/掺杂技术，该技术导致亚微米晶粒的最佳微观结构，纳米氧化物颗粒均匀分布在晶粒内部。我们的方法可以很容易地适用于大规模工业生产的韧性钼合金，可以广泛的加工和成型在低温下。设计成这样的多组分合金的结构为制造具有高强度和延展性的弥散强化材料提供了一般途径。
The high-temperature stability and mechanical properties of refractory molybdenum alloys are highly desirable for a wide range of critical applications. However, a long-standing problem for these alloys is that they suffer from low ductility and limited formability. Here we report a nanostructuring strategy that achieves Mo alloys with yield strength over 800 MPa and tensile elongation as large as similar to 40% at room temperature. The processing route involves a molecular-level liquid-liquid mixing/doping technique that leads to an optimal microstructure of submicrometre grains with nanometric oxide particles uniformly distributed in the grain interior. Our approach can be readily adapted to large-scale industrial production of ductile Mo alloys that can be extensively processed and shaped at low temperatures. The architecture engineered into such multicomponent alloys offers a general pathway for manufacturing dispersion-strengthened materials with both high strength and ductility.