Author
Junheng Gao
Other affiliations: Zhengzhou University
Bio: Junheng Gao is an academic researcher from University of Sheffield. The author has contributed to research in topics: Materials science & Metallurgy. The author has an hindex of 17, co-authored 26 publications receiving 1369 citations. Previous affiliations of Junheng Gao include Zhengzhou University.
Topics: Materials science, Metallurgy, Alloy, Microstructure, Crystal twinning
Papers
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TL;DR: In this work, instead of addressing the segregation problems, the segregation was utilized to develop a novel microstructure consisting of a nanometre-grained duplex (α+β) structure and micrometre scale β phase with superior mechanical properties.
Abstract: In β titanium alloys, the β stabilizers segregate easily and considerable effort has been devoted to alleviate/eliminate the segregation. In this work, instead of addressing the segregation problems, the segregation was utilized to develop a novel microstructure consisting of a nanometre-grained duplex (α+β) structure and micrometre scale β phase with superior mechanical properties. An as-cast Ti-9Mo-6W alloy exhibited segregation of Mo and W at the tens of micrometre scale. This was subjected to cold rolling and flash annealing at 820 oC for 2 and 5 mins. The solidification segregation of Mo and W leads to a locally different microstructure after cold rolling (i.e., nanostructured β phase in the regions rich in Mo and W and plate-like martensite and β phase in regions relatively poor in Mo and W), which play a decisive role in the formation of the heterogeneous microstructure. Tensile tests showed that this alloy exhibited a superior combination of high yield strength (692 MPa), high tensile strength (1115 MPa), high work hardening rate and large uniform elongation (33.5%). More importantly, the new technique proposed in this work could be potentially applicable to other alloy systems with segregation problems.
431 citations
TL;DR: In this article, the preferential nucleation site, subsequent grain growth and evolution of recrystallization texture in double twins has been tracked in individual twins through the whole annealing process for the first time.
189 citations
TL;DR: In this paper, the deformation mechanisms were systematically investigated using EBSD and TEM for samples strained to 1.3, 5% and 16% and a substantial 33.3% uniform elongation was achieved.
174 citations
TL;DR: In this paper, a quasi-in-situ electron backscatter diffraction method was used to track the evolution of the rare earth texture during annealing at 490°C.
148 citations
TL;DR: In this paper, the HPT-treated sample exhibited homogeneous corrosion due to the uniform distribution of the second phase of the nano-sized particles and distributed uniformly in grain interiors instead of along grain boundaries.
124 citations
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Journal Article•
28,685 citations
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TL;DR: Lipson and Steeple as mentioned in this paper interpreted X-ray powder diffraction patterns and found that powder-diffraction patterns can be represented by a set of 3-dimensional planes.
Abstract: Interpretation of X-ray Powder Diffraction Patterns . By H. Lipson and H. Steeple. Pp. viii + 335 + 3 plates. (Mac-millan: London; St Martins Press: New York, May 1970.) £4.
1,867 citations
TL;DR: The analysis of the literature showed that many studies have focused on calcium phosphate coatings produced either using conversion or deposition methods which were developed for orthopaedic applications, however, the control of phases and the formation of cracks still appear unsatisfactory.
1,042 citations
TL;DR: Not only is zinc a physiologically relevant metal with behavior that promotes healthy vessels, but it combines the best behaviors of both current bioabsorbable stent materials: iron and magnesium.
Abstract: Zinc is proposed as an exciting new biomaterial for use in bioabsorbable cardiac stents. Not only is zinc a physiologically relevant metal with behavior that promotes healthy vessels, but it combines the best behaviors of both current bioabsorbable stent materials: iron and magnesium. Shown here is a composite image of zinc degradation in a murine (rat) artery.
621 citations
TL;DR: A review of state-of-the-art of magnesium alloy implants and devices for orthopedic, cardiovascular and tissue engineering applications is presented in this article, where advances in new alloy design, novel structure design and surface modification are overviewed.
580 citations