@article{yuan_ma_jiang_gou_song_yang_jian_2016, title={High mechanical properties of rolled ZK60 Mg alloy through pre-equal channel angular pressing}, number={4}, journal={Mechanika}, author={Yuan, Y. C. and Ma, A. B. and Jiang, J. H. and Gou, X. F. and Song, D. and Yang, D. H. and Jian, W. W.}, year={2016}, pages={256–259} }
 @article{tao_chen_jian_wang_zhu_zhu_langdon_2015, title={Anneal hardening of a nanostructured Cu-Al alloy processed by high-pressure torsion and rolling}, volume={628}, ISSN={["1873-4936"]}, DOI={10.1016/j.msea.2015.01.055}, abstractNote={Abstract A Cu–7 wt% Al alloy was processed by high-pressure torsion and rolling to obtain nanostructure and then annealed at a series of different temperatures. Annealing at 250 °C for 120 min produced higher strength, which is attributed to the formation of nanoscale annealing twins. It is proposed that the high densities of stacking faults and nonequilibrium grain boundaries, combined with the high residual shear stresses in the deformed samples, contribute to the development of nanoscale annealing twins during the recrystallization process.}, journal={MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING}, author={Tao, Jingmei and Chen, Guangming and Jian, Weiwei and Wang, Jun and Zhu, Yuntian and Zhu, Xinkun and Langdon, Terence G.}, year={2015}, month={Mar}, pages={207–215} }
 @article{zhou_wang_guo_ye_jian_xu_ma_moering_2015, title={Finite element simulation and experimental investigation on homogeneity of Mg-9.8Gd-2.7Y-0.4Zr magnesium alloy processed by repeated-upsetting}, volume={225}, ISSN={["0924-0136"]}, DOI={10.1016/j.jmatprotec.2015.06.010}, abstractNote={A novel severe plastic deformation (SPD) process called repeated-upsetting (RU), which produces homogenous samples of large size, is employed to process a high performance magnesium alloy Mg-9.8Gd-2.7Y-0.4Zr at 350 °C with 1–4 passes. Homogenous microstructure and mechanical properties can be achieved after 4 passes of RU. Experimental and finite-element modeling results show that effective strain accumulation with more passes can improve both grain refinement and micro-hardness of samples.}, journal={JOURNAL OF MATERIALS PROCESSING TECHNOLOGY}, author={Zhou, H. and Wang, Q. D. and Guo, W. and Ye, B. and Jian, W. W. and Xu, W. Z. and Ma, X. L. and Moering, J.}, year={2015}, month={Nov}, pages={310–317} }
 @article{zhou_xu_jian_cheng_ma_guo_mathaudhu_wang_zhu_2014, title={A new metastable precipitate phase in Mg-Gd-Y-Zr alloy}, volume={94}, ISSN={["1478-6443"]}, DOI={10.1080/14786435.2014.913115}, abstractNote={Mg–RE alloys are among the strongest Mg-based alloys due to their unique precipitation structures. A previously unobserved metastable phase (βT) is found to coexist with reported β″ and β′ metastable phases under peak ageing conditions in a Mg–Gd–Y–Zr alloy. The position of the RE elements within the βT phase is identified using atomic-resolution high-angle annular dark field scanning transmission electron microscopy imaging, and the βT phase is shown to have an orthorhombic structure with a stoichiometry of Mg5RE. Based on these observations, a new precipitation sequence is proposed.}, number={21}, journal={PHILOSOPHICAL MAGAZINE}, author={Zhou, H. and Xu, W. Z. and Jian, W. W. and Cheng, G. M. and Ma, X. L. and Guo, W. and Mathaudhu, S. N. and Wang, Q. D. and Zhu, Y. T.}, year={2014}, pages={2403–2409} }
 @article{cheng_yuan_jian_xu_millett_zhu_2013, title={Deformation-induced omega phase in nanocrystalline Mo}, volume={68}, ISSN={["1359-6462"]}, DOI={10.1016/j.scriptamat.2012.09.033}, abstractNote={A deformation-induced hexagonal ω phase was first observed in pure nanocrystalline body-centered cubic (bcc) Mo using high-resolution transmission electron microscopy. As the grains were refined into nanometer sizes by deformation using high-pressure torsion under a pressure of ∼4 GPa at room temperature, the ω phase formed at the grain boundaries of bcc Mo with a crystallographic relationship close to the {1 1 2}〈1 1 1〉 twin orientation. Its formation was mainly attributed to the shear deformation on {1 1 2} planes in bcc Mo.}, number={2}, journal={SCRIPTA MATERIALIA}, author={Cheng, G. M. and Yuan, H. and Jian, W. W. and Xu, W. Z. and Millett, P. C. and Zhu, Y. T.}, year={2013}, month={Jan}, pages={130–133} }
 @article{cheng_xu_jian_yuan_tsai_zhu_zhang_millett_2013, title={Dislocations with edge components in nanocrystalline bcc Mo}, volume={28}, DOI={10.1557/jmr.2012.403}, abstractNote={We report high-resolution transmission electron microscopy (HRTEM) observation of a high density of dislocations with edge components (~10^16 m^-2) in nanocrystalline (NC) body-centered cubic (bcc) Mo prepared by high-pressure torsion. We also observed for the first time of the ½<111> and <001> pure edge dislocations in NC Mo. Crystallographic analysis and image simulations reveal that the best way using HRTEM to study dislocations with edge components in bcc systems is to take images along <110> zone axis, from which it is possible to identify ½<111> pure edge dislocations, and edge components of ½<111> and <001> mixed dislocations. The <001> pure edge dislocations can only be identified from <100> zone axis. The high density of dislocations with edge components is believed to play a major role in the reduction of strain rate sensitivity in NC bcc metals and alloys.}, number={13}, journal={Journal of Materials Research}, author={Cheng, G. M. and Xu, W. Z. and Jian, W. W. and Yuan, H. and Tsai, M. H. and Zhu, Y.T. and Zhang, Y. F. and Millett, P. C.}, year={2013}, pages={1820–1826} }
 @article{xu_zhang_cheng_jian_millett_koch_mathaudhu_zhu_2013, title={In-situ atomic-scale observation of irradiation-induced void formation}, volume={4}, ISSN={["2041-1723"]}, DOI={10.1038/ncomms3288}, abstractNote={The formation of voids in an irradiated material significantly degrades its physical and mechanical properties. Void nucleation and growth involve discrete atomic-scale processes that, unfortunately, are not yet well understood due to the lack of direct experimental examination. Here we report an in-situ atomic-scale observation of the nucleation and growth of voids in hexagonal close-packed magnesium under electron irradiation. The voids are found to first grow into a plate-like shape, followed by a gradual transition to a nearly equiaxial geometry. Using atomistic simulations, we show that the initial growth in length is controlled by slow nucleation kinetics of vacancy layers on basal facets and anisotropic vacancy diffusivity. The subsequent thickness growth is driven by thermodynamics to reduce surface energy. These experiments represent unprecedented resolution and characterization of void nucleation and growth under irradiation, and might help with understanding the irradiation damage of other hexagonal close-packed materials. The irradiation of crystalline materials is known to create various types of lattice defects, which can degrade mechanical performance. Here, Xu et al. observe the in-situnucleation and growth of atomic-scale voids in magnesium during electron irradiation.}, journal={NATURE COMMUNICATIONS}, author={Xu, Weizong and Zhang, Yongfeng and Cheng, Guangming and Jian, Weiwei and Millett, Paul C. and Koch, Carl C. and Mathaudhu, Suveen N. and Zhu, Yuntian}, year={2013}, month={Aug} }
 @article{tsai_yuan_cheng_xu_tsai_tsai_jian_juan_shen_chuang_et al._2013, title={Morphology, structure and composition of precipitates in Al0.3CoCrCu0.5FeNi high-entropy alloy}, volume={32}, ISSN={["1879-0216"]}, DOI={10.1016/j.intermet.2012.07.036}, abstractNote={High-entropy alloy is a new class of metallic materials with great potential for many applications. However, their microstructural characteristics, particularly those of precipitates, remain poorly understood. This has hindered the establishment of structure-property relationship in these alloys. Here, we report the morphology, crystal structure and composition of the precipitates in the Al0.3CoCrCu0.5FeNi high-entropy alloy. Two types of precipitates were identified, namely the plate-like and the spherical precipitates. Their formation sequence and mechanism during the cooling process are discussed based on thermodynamics.}, journal={INTERMETALLICS}, author={Tsai, Ming-Hung and Yuan, Hao and Cheng, Guangming and Xu, Weizong and Tsai, Kun-Yo and Tsai, Che-Wei and Jian, Weiwei W. and Juan, Chien-Chang and Shen, Wan-Jui and Chuang, Ming-Hao and et al.}, year={2013}, month={Jan}, pages={329–336} }
 @article{yuan_ma_jiang_lu_jian_song_zhu_2013, title={Optimizing the strength and ductility of AZ91 Mg alloy by ECAP and subsequent aging}, volume={588}, ISSN={["1873-4936"]}, DOI={10.1016/j.msea.2013.09.052}, abstractNote={We report an effective approach to achieve an excellent combination of high strength and good ductility in the AZ91 Mg alloy. The approach involves solution heat treatment, equal channel angular pressing (ECAP) and subsequent aging. This approach is effective in accumulating dislocations and promoting the formation of large spherical precipitates during ECAP. The aging produced much finer precipitates with uniform distribution inside the grains. The hierarchical precipitate structure produced by the current approach rendered high strength and good ductility.}, journal={MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING}, author={Yuan, Yuchun and Ma, Aibin and Jiang, Jinghua and Lu, Fumin and Jian, Weiwei and Song, Dan and Zhu, Yuntian T.}, year={2013}, month={Dec}, pages={329–334} }
 @article{jian_cheng_xu_koch_wang_zhu_mathaudhu_2013, title={Physics and model of strengthening by parallel stacking faults}, volume={103}, ISSN={0003-6951 1077-3118}, url={http://dx.doi.org/10.1063/1.4822323}, DOI={10.1063/1.4822323}, abstractNote={We have recently reported that parallel stacking faults (SFs) can tremendously increase the strength of a magnesium alloy. The strengthening is found to increase linearly with the reciprocal of the mean SF spacing, d. In this study we analyze dislocation interactions with SFs, and then propose a physics-based model to explain the observed relationship between yield strength and SFs spacing. Similar to the empirical Hall-Petch relationship for grain size, it is expected that this strengthening mechanism will hold true for a variety of materials engineered with parallel spaced stacking faults over a wide range of fault spacing.}, number={13}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Jian, W. W. and Cheng, G. M. and Xu, W. Z. and Koch, C. C. and Wang, Q. D. and Zhu, Y. T. and Mathaudhu, S. N.}, year={2013}, month={Sep}, pages={133108} }
 @article{tsai_yuan_cheng_xu_jian_chuang_juan_yeh_lin_zhu_et al._2013, title={Significant hardening due to the formation of a sigma phase matrix in a high entropy alloy}, volume={33}, ISSN={["1879-0216"]}, DOI={10.1016/j.intermet.2012.09.022}, abstractNote={The hardening in Al0.3CrFe1.5MnNi0.5 high-entropy alloy not only nearly triples the hardness of the alloy, but also shows a quick hardening response and the absence of overaging. However, the crystal structure, morphology, and composition of the hardening phase have not yet been confirmed. Here, such information regarding the hardening phase is investigated. It was found that the hardening phase is a Cr–Mn–Fe ternary sigma phase. Unlike in conventional engineering alloys, the sigma phase is not precipitated from the matrix, instead, the whole BCC matrix transforms to sigma phase almost without changing its composition. Therefore, the hardening phenomenon is not a precipitation hardening reaction as suggested before.}, journal={INTERMETALLICS}, author={Tsai, Ming-Hung and Yuan, Hao and Cheng, Guangming and Xu, Weizong and Jian, Weiwei W. and Chuang, Ming-Hao and Juan, Chien-Chang and Yeh, An-Chou and Lin, Su-Jien and Zhu, Yuntian and et al.}, year={2013}, month={Feb}, pages={81–86} }
 @article{sarma_jian_wang_conrad_zhu_2010, title={Effect of rolling temperature on the evolution of defects and properties of an Al-Cu alloy}, volume={45}, ISSN={["0022-2461"]}, DOI={10.1007/s10853-010-4484-6}, number={17}, journal={JOURNAL OF MATERIALS SCIENCE}, author={Sarma, V. Subramanya and Jian, W. W. and Wang, J. and Conrad, H. and Zhu, Y. T.}, year={2010}, month={Sep}, pages={4846–4850} }
 @article{sarma_wang_jian_kauffmann_conrad_freudenberger_zhu_2010, title={Role of stacking fault energy in strengthening due to cryo-deformation of FCC metals}, volume={527}, ISSN={["1873-4936"]}, DOI={10.1016/j.msea.2010.08.015}, abstractNote={The effectiveness of the cryogenic (CT) rolling vis-à-vis room temperature (RT) rolling on strengthening is significantly affected by stacking fault energy (SFE) and there is an optimum SFE at which CT rolling is most effective. Studies on Al, Al alloy AA6061, Cu, Cu–4.6Al, Cu–9Al and Cu–15Al (in at.%) alloys revealed that in metals with very high and very low SFEs, the strength difference between CT and RT rolled samples is <10%. The Cu–4.6Al alloy with an intermediate SFE revealed maximum enhancement of strength (25–30%). These results are explained by changes in deformation mechanisms with SFE and temperature. High SFE metals deformed by dislocation slip and low SFE metals deformed by twinning during CT and RT rolling. Metals with intermediate SFEs deformed by twinning during CT rolling but by dislocation slip during RT rolling, and this makes the CT rolling most effective over RT rolling in enhancing the strength.}, number={29-30}, journal={MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING}, author={Sarma, V. Subramanya and Wang, J. and Jian, W. W. and Kauffmann, A. and Conrad, H. and Freudenberger, J. and Zhu, Y. T.}, year={2010}, month={Nov}, pages={7624–7630} }