Abstract
Materials with a hexagonal close-packed (hcp) crystal structure such as Mg, Ti and Zr are being used in the transportation, aerospace and nuclear industry, respectively. Material strength and formability are critical qualities for shaping these materials into parts and a pervasive deformation mechanism that significantly affects their formability is deformation twinning. The interaction between grain boundaries and twins has an important influence on the deformation behaviour and fracture of hcp metals. Here, statistical analysis of large data sets reveals that whether twins transmit across grain boundaries depends not only on crystallography but also strongly on the anisotropy in crystallographic slip. We show that increases in crystal plastic anisotropy enhance the probability of twin transmission by comparing the relative ease of twin transmission in hcp materials such as Mg, Zr and Ti.
Highlights
Materials with a hexagonal close-packed crystal structure such as Mg, Ti and Zr are being used in the transportation, aerospace and nuclear industry, respectively
Under continued straining and under the right conditions, twin lamellae can stimulate the formation of another twin on the other side of a grain boundary (GB), appearing as if the twin has propagated across the boundary
We refer to two twins that are connected at the grain boundaries as adjoining twin pairs (ATPs) and those that comprises three or more connected twins as twin chains
Summary
Zr has a strong basal texture, which was processed via clock rolling rather than conventional rolling[23]. Both materials were compressed at 10 À 3 per s along an in-plane direction to activate {1012} twinning. Twins tend to dominate the microstructure, making it difficult to identify the source GBs. EBSD was used to map the orientations within these deformed microstructures[24]. EBSD was used to map the orientations within these deformed microstructures[24] Under their respective temperature, strain-rate conditions and strain levels, the materials twinned significantly such that many grains contained fine twins that were visible in EBSD. ATPs could have formed in one of two ways: (1) the twins formed simultaneously from a GB or (2) they formed in sequence, where the twin in one grain transmitted to the neighbouring a
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