Development of High Strength Cu Alloys of Heusler Matrix with good Workability and Ductility

Cu_2MnAl Heuser合金是一种众所周知的磁性材料，它非常脆，而且还没有采用传统的轧制方法制备。在本工作中，我们试图通过基于相图信息的显微组织控制来提高Cu-Mn-Al合金的强度、延展性和热加工性。(1) Cu-Mn-Al体系的相平衡：500时α、β和γ相的相平衡。C, 600。公元前700年。C和800。C测定。结果表明，Mn的加入使β相稳定。(2) β相有序-无序转变：A2<大于等于>B2<大于等于>(3)力学性能：非化学计量成分的Cu-Mn-Al Heuser合金韧性强，化学计量成分的Cu-Mn-Al Heuser合金脆性大。在非化学计量区，合金具有良好的力学性能，伸长率为（3 ~ 21）%，抗拉强度为（500 ~ 700）MPa，抗拉强度为（700 ~ 1010）MPa。(4)显微组织与力学性能：合金的力学性能特征与合金的有序-无序转变温度和在低温下发生的旋量分解有关。

The Cu_2MnAl Heuser alloy which is well known as magnetic material is very brittle and had not been fabricated by conventional rolling. In this work, we have tried to enhance the strength, ductility and hot workability of the Cu-Mn-Al alloys by microstructural control based on information of phase diagrams.(1)Phase equilibria in Cu-Mn-Al system : Phase equilibria among alpha, beta and gamma phases at 500。C, 600。C, 700。C and 800。C were determined. It was clarified that addition of Mn stabilizes the beta phase.(2)Order-disorder transition in the beta phase : A2<greater than or equal>B2<greater than or equal>L2_1 order-disorder transition temperatures (Tc) were measured by DSC.The Tc strongly depends on(3)Mechanical properties : The Cu-Mn-Al Heuser alloys with non-stoichiometric composition is very ductile and strong, while that at the stoichiometry is brittle. In the non-stoichiometric region, it was shown that the alloys have good mechanical properties with elongation of (3-21)%, 0.2% proof strength in the region of (500-700)MPa and tensile strength in the region of (700-1010)MPa.(4)Microstructure and mechanical properties : The features of mechanical properties in these alloys could relate to the order-disorder transition temperatures and spinodal decomposition which occurs at low temperatures.