Search results for: Z.B. Jiao

Items from 1 to 17 out of 17 results

article

Amorphophallus konjac anthracnose caused by Colletotrichum siamense in China

J.P. Wu, J. Zhou, Z.B. Jiao, J.P. Fu, more

Journal of Applied Microbiology > 128 > 1 > 225 - 231

Aims Amorphophallus konjac is an important commercial crop grown in China because it is the only plant species which is rich in glucomannan concentration. Recently, an outbreak of anthracnose (incidence ranging from 10–15%) was observed in a field survey conducted from June to August 2018. This study aims to identify the causal agent of A. konjac anthracnose. Methods and Results The pathogen was...

article

Heterogeneous precipitation behavior and stacking-fault-mediated deformation in a CoCrNi-based medium-entropy alloy

Y.L. Zhao, T. Yang, Y. Tong, J. Wang, more

Acta Materialia > 2017 > 138 > C > 72-82

Combining high strength and good ductility is highly-desired yet challenging for conventional structural materials. Newly emerging concentrated multi-component alloys with face-centered-cubic structure provide an ultra-ductile matrix, and the precipitation hardening based on these alloys provides a very effective way to achieve a superior strength-ductility combination. Here, we report a high-strength...

article

Compositional and microstructural optimization and mechanical-property enhancement of cast Ti alloys based on Ti-6Al-4V alloy

J.H. Luan, Z.B. Jiao, W.H. Liu, Z.P. Lu, more

Materials Science and Engineering: A > 2017 > 704 > C > 91-101

The effects of alloying additions on the microstructure and mechanical properties of cast Ti alloys based on Ti-6Al-4V were systematically investigated through a combination of thermodynamic calculations and experimental verifications. New cast titanium alloys with significantly improved properties were developed through combining thermodynamic calculations and physical metallurgy principles, which...

article

Co-precipitation of nanoscale particles in steels with ultra-high strength for a new era

Z.B. Jiao, J.H. Luan, M.K. Miller, Y.W. Chung, more

Materials Today > 2017 > 20 > 3 > 142-154

Advanced ultra-high strength steels are highly desirable for a wide range of engineering applications. Nanoscale co-precipitation strengthening in steels has received increasing attention in recent years and has become a new cornerstone for the development of advanced steels with superior combination of mechanical, welding, and irradiation properties for a new era. In this review, we highlight recent...

article

Effects of welding and post-weld heat treatments on nanoscale precipitation and mechanical properties of an ultra-high strength steel hardened by NiAl and Cu nanoparticles

Z.B. Jiao, J.H. Luan, W. Guo, J.D. Poplawsky, more

Acta Materialia > 2016 > 120 > C > 216-227

The effects of welding and post-weld heat treatment (PWHT) on nanoscale co-precipitation, grain structure, and mechanical properties of an ultra-high strength steel were studied through a combination of atom probe tomography (APT) and mechanical tests. Our results indicate that the welding process dissolves all pre-existing nanoparticles and causes grain coarsening in the fusion zone, resulting in...

article

Precipitate transformation from NiAl-type to Ni2AlMn-type and its influence on the mechanical properties of high-strength steels

Z.B. Jiao, J.H. Luan, M.K. Miller, C.Y. Yu, more

Acta Materialia > 2016 > 110 > C > 31-43

The precipitate transformation from NiAl-type to Ni₂AlMn-type and its influence on the mechanical properties of the Fe–5Ni–1Al−xMn (x = 0, 1, 3, and 5 wt.%) alloys were studied thoroughly through a combination of three-dimensional atom probe tomography (APT), first-principles calculations and mechanical tests. APT reveals the precipitation of NiAl-type nanoparticles in the 0-3Mn alloys and the co-precipitation...

article

Strategies for improving ductility of ordered intermetallics

Z.B. Jiao, J.H. Luan, C.T. Liu

Progress in Natural Science: Materials International > 2016 > 26 > 1 > 1-12

Ordered intermetallics possess attractive high-temperature properties; however, low ductility and brittle fracture limit their use as engineering materials in many cases. This paper provides a comprehensive review on the recent progress in the development of ductile ordered intermetallics and summarizes the strategies used to improve the tensile ductility of ordered intermetallics, including control...

article

Precipitation mechanism and mechanical properties of an ultra-high strength steel hardened by nanoscale NiAl and Cu particles

Z.B. Jiao, J.H. Luan, M.K. Miller, C.T. Liu

Acta Materialia > 2015 > 97 > C > 58-67

We report on the alloy design strategies, precipitation mechanism and mechanical properties of an ultra-high strength steel hardened by co-precipitation of nanoscale NiAl and Cu particles. The steel, developed through a computational-aided alloy design approach, exhibits a tensile strength of ∼1.9GPa, an elongation of ∼10% and a reduction in area of ∼40%. Atom probe tomography (APT) reveals an interesting...

article

Effects of boron on the fracture behavior and ductility of cast Ti–6Al–4V alloys

J.H. Luan, Z.B. Jiao, L. Heatherly, E.P. George, more

Scripta Materialia > 2015 > 100 > C > 90-93

Minor amounts of boron additions have been found to greatly enhance the ductility of cast Ti–6Al–4V alloys, which was considered to be due to the grain-size refinement. In this paper, we report our interesting finding that the beneficial effect of boron on the ductility of the cast titanium alloys is due not only to the grain-size refinement but the enhancement of the prior-β grain-boundary cohesion...

article

Effects of boron additions and solutionizing treatments on microstructures and ductility of forged Ti–6Al–4V alloys

J.H. Luan, Z.B. Jiao, G. Chen, C.T. Liu

Journal of Alloys and Compounds > 2015 > 624 > Complete > 170-178

The effects of boron additions on the microstructure and mechanical properties of forged Ti–6Al–4V alloys in different heat-treatment conditions have been characterized by both experimental studies and thermodynamic calculations. The results indicate a combination of proper post-forging treatments and B additions are helpful for control of the prior-β grain size and the volume fraction of α phase,...

article

Effects of Mn partitioning on nanoscale precipitation and mechanical properties of ferritic steels strengthened by NiAl nanoparticles

Z.B. Jiao, J.H. Luan, M.K. Miller, C.Y. Yu, more

Acta Materialia > 2015 > 84 > C > 283-291

The critical role of Mn partitioning in the formation of ordered NiAl nanoparticles in ferritic steels has been examined through a combination of atom probe tomography (APT) and thermodynamic and first-principles calculations. Our APT study reveals that Mn partitions to the NiAl nanoparticles, and dramatically increases the particle number density by more than an order of magnitude, leading to a threefold...

article

High-strength steels hardened mainly by nanoscale NiAl precipitates

Z.B. Jiao, J.H. Luan, Z.W. Zhang, M.K. Miller, more

Scripta Materialia > 2014 > 87 > Complete > 45-48

NiAl-strengthened high-strength steels usually have high Ni and Al contents in order to form hardening particles. Here, several new low-Ni steels are reported, which achieve a combination of relatively low cost, high strength and good ductility mainly through the precipitation of high number densities of nanoscale NiAl precipitates as characterized by atom probe tomography. The precipitation parameters...

article

Improved ductility and oxidation resistance of cast Ti–6Al–4V alloys by microalloying

J.H. Luan, Z.B. Jiao, G. Chen, C.T. Liu

Journal of Alloys and Compounds > 2014 > 602 > Complete > 235-240

The effects of B and Y on the mechanical properties and oxidation behavior of cast Ti–6Al–4V alloys were systematically investigated, and the new alloys with improved ductility and oxidation resistance are developed by the microalloying approach. The results indicate that boron is beneficial for improving the ductility by not only grain-size refinement but also grain-boundary enhancement, while yttrium...

article

Synergistic effects of Cu and Ni on nanoscale precipitation and mechanical properties of high-strength steels

Z.B. Jiao, J.H. Luan, Z.W. Zhang, M.K. Miller, more

Acta Materialia > 2013 > 61 > 16 > 5996-6005

There is an increasing demand for ultrahigh-strength ferritic steels strengthened by nanoprecipitates. Improvement of the precipitation strengthening response requires an understanding of the nanoscale precipitation mechanisms. In this study, the synergistic effects of Cu and Ni on nanoscale precipitation and mechanical properties of ferritic steels were thoroughly investigated, and new steels with...

article

Effects of alloying elements on glass formation, mechanical and soft-magnetic properties of Fe-based metallic glasses

Z.B. Jiao, H.X. Li, J.E. Gao, Y. Wu, more

Intermetallics > 2011 > 19 > 10 > 1502-1508

Effects of alloying additions on glass formation, mechanical and soft-magnetic properties of Fe-(Si,P,C,B)-based bulk metallic glasses (BMGs) were systemically studied in detail. It was found that the glass-forming ability (GFA) and the optimum doping content strongly depend on the electronegativity of the alloying elements, which are discussed in terms of liquid phase stability and crystallization...

article

Synthesis of bulk glassy Fe–C–Si–B–P–Ga alloys with high glass-forming ability and good soft-magnetic properties

H.X. Li, Z.B. Jiao, J.E. Gao, Z.P. Lu

Intermetallics > 2010 > 18 > 10 > 1821-1825

Effects of Ga additions on the glass-forming ability (GFA) and magnetic properties of the Fe ₇₆ C _7.0 Si _3.3 B _5.0 P _8.7 alloy were investigated. It was found that addition of 1–2% Ga can increase the critical diameter for glass formation from 1 to 3 mm. Moreover, the as-cast alloy containing 1% Ga exhibit good soft-magnetic properties including a high saturation...

article

Glass formation and magnetic properties of Fe–C–Si–B–P–(Cr–Al–Co) bulk metallic glasses fabricated using industrial raw materials

H.X. Li, S.L. Wang, S. Yi, Z.B. Jiao, more

Journal of Magnetism and Magnetic Materials > 2009 > 321 > 18 > 2833-2837

Formation of Fe–C–Si–B–P–(Cr–Al–Co) bulk metallic glasses with enhanced glass-forming ability (GFA) and magnetic properties fabricated using industrial pig-iron and Fe–P alloys as raw materials has been studied. It was found that GFA of the pig-iron (Fe _79.5 C _18.0 Si _2.3 P _0.2 , at%) could be improved by proper additions of only metalloids C, Si, P and B, and fully...

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