Journal of Materials Research and Technology-Jmr&t最新文献

{"title":"Effect of interlayer ultrasonic impact on the microstructure, mechanical and corrosion properties of wire arc additive manufacturing AZ31 Mg alloy thin wall","authors":"Xiao Liu ,&nbsp;Siqi Yin ,&nbsp;Guangzong Zhang ,&nbsp;Yi Li ,&nbsp;Renguo Guan","doi":"10.1016/j.jmrt.2024.09.040","DOIUrl":"10.1016/j.jmrt.2024.09.040","url":null,"abstract":"<div><p>AZ31 Mg alloy thin walls are prepared using wire arc additive manufacturing (WAAM) and interlayer ultrasonic impact (UI) techniques with cold metal transition (CMT) serving as the heat source. The microstructure, mechanical and corrosion properties of thin walls prepared by WAAM and WAAM + UI are studied. Results showed that the recrystallization area fraction along traveling direction (TD) increased by 68.6% after UI treatment, and many fine equiaxed crystals were formed, resulting in grain refinement, anisotropy reduction, mechanical and corrosion properties improvement. The average grain size along TD decreased from 66.6 ± 3.5 μm to 32.7 ± 1.6 μm. Through UI treatment, the ultimate tensile strength (UTS) and elongation (EL) along TD increased from 205 MPa to 230 MPa and 13.5%–17%, respectively. The anisotropic percentage of UTS and EL were decreased from 10.8% to 4.5%, and 42.1%–9.7%, respectively. Electrochemical experimental results showed that the average corrosion rate along TD decreased from 1.93 mm year⁻¹ to 1.53 mm year⁻¹. Grain refinement, dislocation density variation and texture strength reduction were the main reasons for these results.</p></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"33 ","pages":"Pages 180-192"},"PeriodicalIF":6.2,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2238785424020453/pdfft?md5=8243c5695abba951d3931e1c5b2815fe&pid=1-s2.0-S2238785424020453-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of cooling rate on eutectoid transformation of β phase in copper-beryllium alloy","authors":"Xiaoyu Jiang ,&nbsp;Qiuhua Guo ,&nbsp;Wei Chen ,&nbsp;Linhan Li ,&nbsp;Yanbin Jiang ,&nbsp;Can Wang ,&nbsp;Daibo Zhu ,&nbsp;Shuhui Cui ,&nbsp;Mingda Han ,&nbsp;Zhou Li","doi":"10.1016/j.jmrt.2024.09.071","DOIUrl":"10.1016/j.jmrt.2024.09.071","url":null,"abstract":"<div><p>The copper (Cu)-beryllium (Be) alloy is a critical material for high-performance photomultiplier cathodes. The microstructure evolution of the β phase in the Cu-2.8Be alloy subjected to cooling rate ranging from 0.5 to 80 °C/s after heat treatment. The non-isothermal phase transformation kinetics equation of the alloy was derived. At a cooling rate of 0.5 °C/s, the β phase completely transformed into the α phase and γ phase through a eutectoid reaction (β → α + γ). The γ phase preferentially precipitates at locations with higher free energy, such as grain boundaries and defects in the parent phase. The orientation relationship between the α phase and the γ phase follows the Kurdjumov-Sachs (K–S) relationship (<span><math><mrow><msub><mrow><mo>[</mo><mn>110</mn><mo>]</mo></mrow><mi>α</mi></msub><mo>∥</mo><msub><mrow><mo>[</mo><mn>111</mn><mo>]</mo></mrow><mi>γ</mi></msub></mrow></math></span>; <span><math><mrow><msub><mrow><mo>(</mo><mrow><mn>1</mn><mover><mn>1</mn><mo>‾</mo></mover><mover><mn>1</mn><mo>‾</mo></mover></mrow><mo>)</mo></mrow><mi>α</mi></msub><mo>∥</mo><msub><mrow><mo>(</mo><mrow><mn>0</mn><mover><mn>1</mn><mo>‾</mo></mover><mn>1</mn></mrow><mo>)</mo></mrow><mi>γ</mi></msub></mrow></math></span>), and the α phase nucleates and grows with a twin relationship to the Cu matrix. As the cooling rate increases, the transformation fraction of the β phase decreases. The critical cooling rate at which the β phase eutectoid reaction is completely suppressed is 80 °C/s. A non-isothermal phase transformation kinetics equation for the β phase eutectoid transformation was established: <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>r</mi><mo>)</mo></mrow><mo>=</mo><mn>1</mn><mo>−</mo><mi>exp</mi><mrow><mo>{</mo><mrow><mo>−</mo><msup><mrow><mo>{</mo><mrow><mn>34.703</mn><msup><mi>r</mi><mrow><mo>−</mo><mn>1.062</mn></mrow></msup><mrow><mo>[</mo><mrow><mi>exp</mi><mrow><mo>(</mo><mrow><mo>−</mo><msup><mn>0.9107</mn><mi>r</mi></msup></mrow><mo>)</mo></mrow><mo>−</mo><mn>0.3575</mn></mrow><mo>]</mo></mrow></mrow><mo>}</mo></mrow><mn>2.2</mn></msup></mrow><mo>}</mo></mrow></mrow></math></span>, elucidating the relationship between the phase transformation fraction and the cooling rate, which provides a theoretical basis for controlling the microstructure of Cu–Be alloy through heat treatment. Validated by the Cu-3.3Be alloy, this equation demonstrates excellent universality.</p></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"33 ","pages":"Pages 821-833"},"PeriodicalIF":6.2,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2238785424020763/pdfft?md5=493e62e65b8897d8226147c7f15b0ae8&pid=1-s2.0-S2238785424020763-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure evolution and constitutive modeling of Cu-bearing high-strength low-alloy steel during hot deformation","authors":"Liye Kan ,&nbsp;Qibin Ye ,&nbsp;Shiwei Zhang ,&nbsp;Zhaodong Wang","doi":"10.1016/j.jmrt.2024.09.052","DOIUrl":"10.1016/j.jmrt.2024.09.052","url":null,"abstract":"<div><p>The microstructural evolution of austenite during hot deformation determines the mechanical properties of steel products. Consequently, industrial applications necessitate a thorough comprehension and modeling of this process. Under varied hot deformation conditions, the flow stress, microstructure evolution, and constitutive modeling of a Cu-bearing steel were examined. At various temperatures and strain rates, compression experiments are conducted, and the resulting microstructures were studied by electron backscatter diffraction (EBSD). Our results indicate that fine prior austenite grains with an average diameter of 22.1 m and a high-angle grain boundary density of 0.25 m1 were produced at a deformation temperature of 950 °C and a strain rate of 1 s⁻¹. The dominating rotating cube components ({001}&lt;110&gt;) in the sample deformed at 1150 °C were gradually replaced by the γ-fiber texture component as the deformation temperature decreased. To accurately predict the flow behavior of this steel, we proposed an improved Arrhenius constitutive model that accounts for strain rate and adiabatic temperature rise. With a correlation coefficient (<em>Rc</em>) of 0.9936, a root mean square error (<em>RMSE</em>) of 4.92%, and a relative error (<em>δ</em>) of 6.05 MPa, our results demonstrate that this model predicts the flow stress of the experimental steel with good precision. This research contributes to the development of high-performance steel products by shedding light on the microstructural evolution and flow behavior of Cu-containing steels under hot deformation conditions.</p></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"33 ","pages":"Pages 212-222"},"PeriodicalIF":6.2,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2238785424020568/pdfft?md5=83f08fff85ebcaa89e681b56ac5eec2f&pid=1-s2.0-S2238785424020568-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New insights from crystallography into the effect of Ni content on ductile-brittle transition temperature of 1000 MPa grade high-strength low-alloy steel","authors":"Zeqing Ni ,&nbsp;Jingxiao Zhao ,&nbsp;Xuelin Wang ,&nbsp;Chengjia Shang ,&nbsp;Wenhao Zhou","doi":"10.1016/j.jmrt.2024.09.072","DOIUrl":"10.1016/j.jmrt.2024.09.072","url":null,"abstract":"<div><p>The significant effect of Ni content (0.92, 1.94 and 2.94 wt%) on ductile-brittle transition temperature (DBTT) and microstructure in a 1000 MPa grade high-strength low-alloy (HSLA) steel was studied. Using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), Charpy impact test and low-temperature tensile test to study the fundamental reasons for the effect of Ni content on toughness. The results indicated that increasing the Ni content can reduce the DBTT of HSLA steel and improve the impact toughness at low temperatures. EBSD data post-processing analysis revealed that the key reason for the increase in low-temperature toughness is the refinement of the microstructural crystallographic structure, specifically the significant increase in the boundary density of the block and packet. With the increase of Ni content, the density of grain boundary with an orientation difference greater than 5° between two adjacent {110} crystal planes was higher, which can form a higher density of dislocation pile-up group, thus better reducing local stress concentration. Meanwhile, the stacking fault energy (SFE) increases with the increase of Ni content, which made the screw dislocation more prone to cross slip at low temperature, resulting in an increase in plasticity at low temperatures. These observed phenomena and reasons provided a theoretical explanation for the role of Ni content in reducing DBTT and enhancing the toughness of the core in heavy gauge plates.</p></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"33 ","pages":"Pages 589-599"},"PeriodicalIF":6.2,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2238785424020775/pdfft?md5=432c51e3a2273c5199a769b408e9038c&pid=1-s2.0-S2238785424020775-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving plasticity by Si-addition-induced coherent nanoprecipitates in Cu–Al–Mn alloy fabricated by laser powder bed fusion","authors":"Ying Li ,&nbsp;Mingzhu Dang ,&nbsp;Honghao Xiang ,&nbsp;Yue Hou ,&nbsp;Qingsong Wei","doi":"10.1016/j.jmrt.2024.09.035","DOIUrl":"10.1016/j.jmrt.2024.09.035","url":null,"abstract":"<div><p>In this paper, the Cu-10.8Al-8.3Mn-0.37Si alloy containing Mn₅Si₃ phase was obtained by adding Si element to the Cu-10.8Al-8.3Mn alloy. The two alloys were printed by laser powder bed fusion. The changes in the organization and tensile properties of the alloys and the mechanism were investigated. After Si addition, the Mn₅Si₃ nano phase precipitated in the alloy in addition to the β₁ austenite phase. The Mn₅Si₃ phase was co-lattice with the β₁ phase with an average size of 10 nm and was diffusely distributed. Standard tensile experiments showed that the yield strength of the Cu-10.8Al-8.3Mn-0.37Si alloy decreased by 57.7% and the elongation increased by 266% compared to the Cu-10.8Al-8.3Mn alloy, while the tensile strength remained essentially unchanged. The presence of Mn₅Si₃ phase provided nucleation points for martensite and promoted the generation of stress-induced martensite. Hence the yield strength was reduced. TEM results showed that the β₁ phase in the Cu-10.8Al-8.3Mn-0.37Si alloy was fully transformed into stress-induced martensite after deformation, which displayed the transformation induced plasticity effect and hindered the slip of dislocations. Meanwhile, the Mn₅Si₃ phase was sheared by the stacking faults, which promoted the accumulation of hetero-deformation-induced stress. Therefore, the hardening capacity and plasticity of the Cu-10.8Al-8.3Mn-0.37Si alloy were enhanced. This work provides a new idea for the plasticity enhancement of Cu–Al–Mn-based shape memory alloys achieved by co-lattice nano-precipitated phase strengthening.</p></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"33 ","pages":"Pages 70-78"},"PeriodicalIF":6.2,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2238785424020416/pdfft?md5=d0f58f3bb86f19fddef1cdade1159b3c&pid=1-s2.0-S2238785424020416-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142168075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructural evolution of GH4079 superalloy during hot deformation and heat treatment","authors":"Wenwen Zhang ,&nbsp;Xingang Liu ,&nbsp;Tonggang Lu ,&nbsp;Yunlong Liu ,&nbsp;Ying Guo ,&nbsp;Heyong Qin ,&nbsp;Qiang Tian","doi":"10.1016/j.jmrt.2024.09.030","DOIUrl":"10.1016/j.jmrt.2024.09.030","url":null,"abstract":"<div><p>Through hot compression and subsequent heat treatment experiments on GH4079 superalloy, the influence of different hot deformation and heat treatment conditions on the evolution of GH4079 superalloy microstructure was studied. The evolution of grains and γ′ phases under different thermomechanical conditions was investigated. The results indicate that at deformation temperatures above 1100 °C and strain rates ranging from 0.01 to 0.1 s⁻¹, the primary mechanism of dynamic softening in the alloy is discontinuous dynamic recrystallization (DDRX). When the deformation temperature is below 1100 °C and strain rates range from 0.01 to 0.1 s⁻¹, both continuous dynamic recrystallization (CDRX) and DDRX are the main dynamic softening mechanisms. Due to high strain energy accumulation, the samples deformed at lower temperatures (below 1100 °C) and then solution-treated at 1120 °C for 8 h exhibit significant increases in recrystallization volume fraction and recrystallization grain size. Conversely, the samples deformed at higher temperatures (above 1100 °C) and then solution-treated at 1120 °C for 8 h show minimal changes in recrystallization volume fraction and recrystallization grain size. After solution treatment at 1140 °C, the grain size of the alloy significantly increases. The samples deformed at higher strain rates exhibit the evolution of fine γ′ phases into elongated rod shapes during solution treatment, while larger γ′ phases undergo splitting processes.</p></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"33 ","pages":"Pages 298-317"},"PeriodicalIF":6.2,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2238785424020313/pdfft?md5=46f4a24c0ccabe4b2d5c25c71c6c0403&pid=1-s2.0-S2238785424020313-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of transition metals (V, Cr, Mn, Fe and Ni) doping on magnetic properties of Co-based amorphous alloys","authors":"Shuwei Lu ,&nbsp;Haiming Duan ,&nbsp;Qiang Li ,&nbsp;Chuntao Chang","doi":"10.1016/j.jmrt.2024.09.067","DOIUrl":"10.1016/j.jmrt.2024.09.067","url":null,"abstract":"<div><p>Amorphous alloys exhibit numerous interesting and abundant magnetic properties due to their disordered structural traits and have been extensively studied by researchers. In this work, the effects of a small amount of transition metals doping on the magnetic properties of Co_80-xM_xB₂₀ (x = 0, 2, 4, 6, 8, 10; M = V, Cr, Mn, Fe, Ni) amorphous alloys were systematically investigated by utilizing first-principles molecular dynamics. The trend of the magnetic moment change in the simulated calculation conforms well to the experimental results. The doping of V atoms leads to the fastest rate of decrease in the magnetic moment of the surrounding Co atoms, and there is only an antiferromagnetic interaction between the V and Co atoms. When doped with Cr and Mn atoms, there is mutual competition between ferromagnetic and antiferromagnetic coupling in the amorphous alloy, Cr reduces the magnetic moment of the surrounding Co atoms, while the change in the magnetic moment of the Co atoms around Mn is small. The doping of Fe and Ni causes an increase in the magnetic moment of the surrounding Co atoms. The reason may be due to the charge transfer between atoms. The doping of Fe and Ni has a small effect on the average magnetic moment of the Co atoms in the amorphous alloy. The results provide necessary theoretical support for the development of the Co-based amorphous alloys with excellent magnetic characteristics.</p></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"33 ","pages":"Pages 193-203"},"PeriodicalIF":6.2,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2238785424020726/pdfft?md5=1b0d0f33ebeb003dd7392fa1bd4e28f2&pid=1-s2.0-S2238785424020726-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative analysis of the micromechanical behavior and work hardening in Fe-0.1C–10Mn steel via in-situ high-energy X-ray diffraction","authors":"Hongwei Gao ,&nbsp;Minghe Zhang ,&nbsp;Ze Ji ,&nbsp;Zhiye Zhang ,&nbsp;Yunli Feng ,&nbsp;Haiyang Chen ,&nbsp;Shilei Li ,&nbsp;Yandong Wang","doi":"10.1016/j.jmrt.2024.09.069","DOIUrl":"10.1016/j.jmrt.2024.09.069","url":null,"abstract":"<div><p>In the current work, the micromechanical behavior and work hardening behavior of Fe-0.1C–10Mn (in wt.%) steel deformed at 100, 63, 25 and −50 °C were investigated via in-situ high-energy X-ray diffraction (HE-XRD) technique. As the deformation temperature decreased, the yield strength (YS) and ultimate tensile strength (UTS) increased, while the total elongation (TE) reached a maximum value at 25 °C. The transformation kinetics of retained austenite (RA) was fitted by the Olson and Cohen (OC) model. The phase stress and flow stress contributed by the constituent phases were obtained based on the lattice strain and the volume fraction of the corresponding phase. The work hardening rate was decomposed into four contributors related to the TRIP effect and load partitioning, ie., the austenite phase stress, load partitioning between austenite and martensite, martensitic formation rate and load partitioning between ferrite and austenite. The influence of each contributor on the work hardening behavior was quantitatively evaluated and stacked, the stacked results agreed reasonably well with the experimental work hardening rate obtained from the true stress-strain curve. Finally, the volume fraction of austenite to martensite transformation promoted by the Lüders band (LB) and the stacking fault energy (SFE) of RA were found to be highly temperature-dependent. A linear relationship was revealed between the volume fraction of austenite to martensite transformation during the LB propagation and the SFE of RA. These findings offer insights into the TRIP effect and the LB propagation in medium-Mn steels.</p></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"33 ","pages":"Pages 773-784"},"PeriodicalIF":6.2,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S223878542402074X/pdfft?md5=10dca5ddc102f4345756ba5dd8a04c71&pid=1-s2.0-S223878542402074X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the orientation dependence of local fields around spherical defects using crystal plasticity simulations","authors":"Nicole K. Aragon,&nbsp;Aashique A. Rezwan,&nbsp;David Montes de Oca Zapiain,&nbsp;Hojun Lim","doi":"10.1016/j.jmrt.2024.09.029","DOIUrl":"10.1016/j.jmrt.2024.09.029","url":null,"abstract":"<div><p>The presence of a void or secondary particle plays a crucial role in both the mechanical response and damage evolution of metals. This work presents local stress and strain field predictions in a single crystalline matrix that contains a spherical void or hard particle using crystal plasticity finite element method (CP-FEM) simulations. Simulations demonstrate highly heterogeneous orientation dependent local fields near defects. In particular, we show that matrix decohesion around hard particles will occur first before void growth in pre-existing voids under strain-controlled uniaxial tension and isochoric loading. Furthermore, CP-FEM simulations predict that the <span><math><mrow><mrow><mo>[</mo><mspace></mspace><mover><mrow><mn>1</mn></mrow><mrow><mo>̄</mo></mrow></mover><mn>11</mn><mo>]</mo></mrow><mspace></mspace></mrow></math></span>-oriented grain is most susceptible for failure, while grains oriented toward the <span><math><mrow><mrow><mo>[</mo><mspace></mspace><mn>001</mn><mo>]</mo></mrow><mspace></mspace></mrow></math></span> orientation are more resistant to failure. This work provides insights into how grain-scale microstructure with volumetric defects influence the local damage and failure behavior in metal alloys.</p></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"33 ","pages":"Pages 235-243"},"PeriodicalIF":6.2,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2238785424020350/pdfft?md5=39fd61894bac4874e845382d0bd42101&pid=1-s2.0-S2238785424020350-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical and experimental investigation of 3D printed tunable stiffness metamaterial with real-time response using digital light processing technology","authors":"Mahdi Khajepour,&nbsp;Abbas Bayati,&nbsp;Behrad Rezaee,&nbsp;Alireza Khatami,&nbsp;Mohammad Amin Soltani,&nbsp;Ghader Faraji,&nbsp;Karen Abrinia,&nbsp;Mostafa Baghani,&nbsp;Majid Baniassadi","doi":"10.1016/j.jmrt.2024.09.059","DOIUrl":"10.1016/j.jmrt.2024.09.059","url":null,"abstract":"<div><p>A tunable mechanical metamaterial is a type that can be altered or manipulated to change its physical properties in various situations. This study introduces a novel type of metamaterial, hydro-tunable metamaterials (HTMs), which can be dynamically adjusted in real-time by filling or draining it with water. The development of HTMs has significant implications for various fields, including mechanical engineering, biomedical applications, and energy absorption. The study involves designing and manufacturing HTMs using a Digital Light Processing (DLP) 3D printing process. The design process involves modifying an initial basic auxetic structure to create a closed and sealed structure accommodating fluid. The printed samples are then characterized using mechanical testing and finite element analysis (FEA). Experiments and simulations have found that a sample containing water behaves differently from a sample without water, resulting in an increase in stiffness. This difference can be leveraged to modify the stiffness and strength of the structure. This phenomenon is attributed to the incompressibility of water within the structure. Water exerts a hydrostatic pressure on the auxetic material, resulting in increased stiffness and resistance to compression. This technique highlights the potential of HTMs to be dynamically adjusted in real-time, leading to enhanced energy absorption and improved performance. An additional FEA was conducted to examine the impact of water pressure on the mechanical behavior of the structure. The results indicate that applying pressure or temperature to the water can significantly enhance the mechanical properties of the water-filled sample.</p></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"33 ","pages":"Pages 480-490"},"PeriodicalIF":6.2,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2238785424020647/pdfft?md5=840c325939d6f1e29c75badcf31261b7&pid=1-s2.0-S2238785424020647-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}