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25 results on '"Liu, Dingming"'

10. Deformation behavior of a TiZr-based metallic glass composite containing dendrites in the supercooled liquid region

Author

Zhang Hong-Wei, Li Zhengkun, Li Hong, Liu Dingming, Zhang Long, Zhang Haifeng, Wang Ai-min, Hua-meng Fu, Zhu Zhengwang, and Wu Longjun

Subjects
Materials science, Amorphous metal, Polymers and Plastics, Mechanical Engineering, Metals and Alloys, Superplasticity, 02 engineering and technology, Work hardening, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, law.invention, Dendrite (crystal), Mechanics of Materials, law, Materials Chemistry, Ceramics and Composites, Formability, Crystallization, Deformation (engineering), Composite material, 0210 nano-technology, Supercooling
Abstract

The deformation behavior of a TiZr-based bulk metallic glass composite (BMGC) was characterized in the supercooled liquid region (SLR) from 623 K to 693 K. It was observed that the alloy exhibits the deformation behavior from work softening at low temperatures to work hardening at high temperatures. The yield stress and overshoot stress decrease remarkably with the increase of temperature, accompanied by superplasticity. The results showed that the crystallization occurred in the amorphous matrix for the post-deformation samples and the volume fraction of the corresponding crystallization products increased with increasing testing temperature. It is implied that the work hardening behavior was closely associated with the crystallization of the amorphous matrix. The tensile stress can accelerate the crystallization of amorphous matrix and the martensitic transformation of dendrite phases, which implies that the thermal stability of the alloy decreases under tension. These findings shed light on designing new BMGCs with high mechanical performance as well as the good SLR formability.

Published
2020

16. How does government spending news affect interest rates? Evidence from the United States

Author

Chen Yong and Liu Dingming

Subjects
Government spending, Economics and Econometrics, 050208 finance, Control and Optimization, Applied Mathematics, media_common.quotation_subject, 05 social sciences, Monetary policy, Variance (accounting), Monetary economics, Affect (psychology), Interest rate, Term (time), Surprise, Shock (economics), 0502 economics and business, Economics, 050207 economics, media_common
Abstract

This study analyzes the effects of news shocks to U.S. government spending on interest rates, especially long-term interest rates, and investigates the role of agents’ expectations in the propagation of government spending to interest rates. Using large Bayesian vector autoregressive models with sufficient information, we find that news about increases in government spending induce significant increases in both short- and long-term interest rates while the effects of government spending surprise shocks on interest rates are mixed and ambiguous. Government spending news shocks in the baseline model account for around 10% of the variance in forecast errors in long-term interest rates, which is much more important than government spending itself. Using empirical dynamic term structural models, we further decompose increases in long-term interest rates into changes in expectations of future monetary policy and changes in term premiums. We find that an increase in the long-term interest rate after a positive government spending news shock mainly reflects higher expected future short-term interest rates, which demonstrates the importance of the coordination between fiscal and monetary policy communication.

Published
2019

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