Frontier Institute of Science and Technology, Xi’an Jiaotong Universit
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DOI:
10.7502/j.issn.1674-3962.2016.06.02
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Abstract:
Strain glass transition was recently discovered in shape memory alloys and show typical glass transition characteristic and abnormal properties from that of normal martensitic transition. Special applications were found based on the abnormal “strain glass” state, such as shape memory, superelasticity and good internal friction. The discovery of strain glass transition not only rich the field of glass materials or disorder materials, but also open new application potential and promote the finding and study of abnormal strain states in shape memory alloys. In this paper, the effect of defects on the thermal stability of martensite and the local distortion in the shape memory alloy is introduced. Through the phase field dynamics simulation, the experimental results reported strain glass transition phenomenon and the related properties are successfully predicted. Phase field simulations establish the full transformation phase diagram which is consistent with the experimental results. The phase field simulations provide a basis for understanding the origin of strain glass. Through the coupling of strain glass model and external field, this paper simulated the abnormal mechanical properties of strain glass transition, including narrow stress strain hysteresis loops, thermal hysteresis and temperature-stress phase diagram in strain glass composition. This work suggest a way to guide the design and development of new shape memory alloys through the application of strain glass transition.