Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： Transformative energy technologies will provide strong strategic support to the realization of peaking carbon dioxide emissions before 2030, and achieving net zero carbon emissions before 2060. Reducing the dependence on fossil fuels by saving energy and reducing emissions from the source is essential to achieve the double-carbon target as soon as possible. Songshan Lake Materials Laboratory is working on key materials to develop solar-battery power systems and electrification of transportation energy to return coal, oil, and natural gas from fuels to materials. This study focuses on introducing the research team of its New Energy Materials and Devices R&D Center with the whole chain innovation mode from research to technology transfer/transformation. Example works of new materials for High Efficiency Crystalline Silicon Solar Cells Group, Li-ion Battery Materials Group, Flexible & Zinc Battery Group are introduced. To get through “the last mile” of technology transformation, research projects and pilot lines have been set up to make new energy materials and devices into products in the past three years, and work together with industrial partners in an innovative workshop cluster model. It is suggested to make overall planning, provide stable support to the research and development, and create a cluster development model with R&D center-innovative workshops#2;industrial parks.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-19 Cooperative journals: 《金属学报》
Abstract： Bulk metallic glass (BMG) composites containing B2-CuZr phase are of interest due to they behave large plastic strain and apparent work hardening in tension. Nevertheless till now most BMG composites containing B2-CuZr phase are based on Cu47.5Zr47.5Al5 or Zr48Cu47.5Al4Co0.5 BMG, which has limited glass forming ability (GFA). The prepared sample size is small, which restricts their potential engineering structural applications. In this work, Zr-Cu-Al-Y quaternary system is selected due to its high GFA. By tuning composition close to CuZr alloy in Zr-Cu-Al-Y quaternary system, Zr46.9Cu45.5Al5.6Y2.0 BMG is selected because it has proper GFA (critical diameter Dc=5 mm) and relatively large fracture toughness (KQ=(49±3) MPa·m1/2). By decreasing the cooling rates of the melt via increasing diameter of casting rods, large-sized in situ Zr46.9Cu45.5Al5.6Y2.0 BMG composites containing 13% and 25% volume fractions spherical B2-CuZr phase were prepared in the casting rods with 6 and 7 mm in diameters, respectively. In compression testing, the in situ BMG composites containing 25%B2-CuZr phase promote multiple shear bands within glass matrix and remarkable global plastic deformation, accompanied by a large compressive plastic strain as 6.5%. Nevertheless in tension testing no obvious global ductility was achieved, which attributes to the low mode I fracture toughness and small plastic zone size (RP=88 mm, RP=(1/3π)(KQ/sy)2 ) of glass matrix. Three point bending test results show that Y has an adverse effect on the fracture toughness and plastic zone size of Zr-Cu-Al BMGs. In contrast to Zr46.9Cu45.5Al5.6Y2.0 BMG, fatigue pre-cracked Zr48Cu45Al7 BMG plate samples can be prepared and exhibit a high fracture toughness (KQ=(62±3) MPa·m1/2) and a large plastic zone size (RP=150 mm) in plane strain state. Our results show that GFA and fracture toughness of glass matrix should be balanced when designing new BMG composites containing B2-CuZr phase.
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