VULCAN Instrument Scientist
--Oak Ridge National Laboratory, Oak Ridge, TN
Instrument Scientist, VULCAN, Chemical and Engineering Materials Division (2010-present).
User support and instrument operation/development; Ongoing research activities include
diffraction studies of nanostructured ferritic alloys and bulk metallic glasses.
Research Associate (2005-2010). Investigated atomic structure, phase transformation
and mechanical properties of bulk amorphous alloys using neutron and synchrotron
--University of Wisconsin-Madison, Madison, WI
Research Associate, Department of Materials Science & Engineering (2003-2005).
Conducted solidification processing of aluminum alloys and microstructure
characterization for thermodynamic database development; Designed and
developed new bulk metallic glasses.
G. M. Stoica, A. D. Stoica, M. K. Miller and D. Ma, “Temperature-dependent elastic anisotropy and mesoscale deformation in a nanostructured ferritic alloy”, Nature Communications, 5:5178, 2014.
Y. Wu, W.H. Liu, X.L. Wang, D. Ma, A.D. Stoica, T.G. Nieh, Z.B. He and Z.P. Lu. “In situ neutron diffraction study of deformation behavior of a multi-component high-entropy alloy”, Applied Physics Letters, 104:051910, 2014.
D. Ma, A. D. Stoica, X-L. Wang, Z. P. Lu, D. Brown, and B. Clausen. “Elastic moduli inheritance and weakest link in bulk metallic glasses”, Physical Review Letters, 108:085501, 2012. (Highlighted by News and View in the April-2012 issue of Nature Materials).
Y. Wu, D. Q. Zhou, W. L. Song, H. Wang, Z. Y. Zhang, D. Ma, X.-L. Wang and Z. P. Lu, “Ductilizing Bulk Metallic Glass Composite by Tailoring Stacking Fault Energy”, Physical Review Letters, 108:245506, 2012.
L. Yang, M. K. Miller, X.-L. Wang, C. T. Liu, A. D. Stoica, D. Ma, J. Almer, and D. Shi, “Nanoscale solute partitioning in devitrified metallic glass”, Advanced Materials, 201:305-308, 2009.
D. Ma, A.D. Stoica and X.-L. Wang, “Power law scaling and fractal nature of medium range order in metallic glasses”, Nature Materials, 8:30-34, 2009.
D. Ma, A. D. Stoica, X.-L. Wang, Z.P. Lu, M. Xu and M. Kramer, “Efficient local atomic packing in metallic glasses and its correlation with glass-forming ability”, Physical Review B, 80:014202, 2009.
D. Ma, A. D. Stoica, L. Yang, X.-L. Wang, Z. P. Lu, J. Neuefeind, M. J. Kramer, J. W. Richardson, and Th. Proffen, “Nearest-neighbor coordination and chemical ordering in Zr-based bulk metallic glasses”, Applied Physics Letters, 90:211908, 2007.
D. Ma, A. D. Stoica and X.-L. Wang, “Volume conservation in bulk metallic glasses”, Applied Physics Letters, 91:21905, 2007.
D. Ma, D. Z. Chi, M. Loomans and S. J. Chua, “Kinetics of NiSi-NiSi2 transition and microstructure evolution in nickel silicide thin films on Si(001)”, Acta Materialia, 54:4905-4911, 2006.
D. Ma and Y. A. Chang, “Competitive formation of ternary metallic glasses”, Acta Materialia, 54:1927-1934, 2006.
H. Cao, D. Ma, K. C. Hsieh, L. Ding, W. G. Stratton, P. M. Voyles, Y. Pan, M. D. Cai, J. T. Dickinson and Y. A. Chang, “Computational thermodynamics to identify Zr–Ti–Ni–Cu–Al alloys with high glass-forming ability”, Acta Materialia, 54:2975-2982, 2006.
D. Ma, H. Cao, K. C. Hiesh, L. Ding and Y. A. Chang, “Bulkier glass formability enhanced by minor alloying additions”, Applied Physics Letters, 87:171914, 2005.
D. Ma, H. Tan, D. Wang, Y. Li and E. Ma, “Strategy for pinpointing the best glass-forming alloys”, Applied Physics Letters, 86:191906, 2005.
H. Tan, Y. Zhang, D. Ma, Y.P. Feng and Y. Li, “Optimum glass formation at off-eutectic composition and its relation to skewed eutectic coupled zone in the La based La-Al-(Cu,Ni) pseudo ternary system”, Acta Materialia, 51:4551-4561, 2003.
A. S. Wong, D. Z. Chi, M. Loomans, D. Ma, M. Y. Lai, W. C. Tjiu, S.J. Chua, C. W. Lim and J. E. Greene, “F-enhanced morphological and thermal stability of NiSi films on BF2+-implanted Si(001)”, Applied Physics Letters, 81:5138-5140, 2002.
D. Ma, Y. Li, S. C. Ng and H. Jones, “Unidirectional solidification of Zn-rich Zn-Cu peritectic alloys-I Microstructure selection”, Acta Materialia, 48:419-431, 2000.
D. Ma, Y. Li, S. C. Ng and H. Jones, “Unidirectional solidification of Zn-rich Zn-Cu peritectic alloys-II Microstructural length scales”, Acta Materialia, 48:1741-1751, 2000.
D. Ma, W. Q. Jie, Y. Li and S. C. Ng, “Effect of weak convection on lamellar spacing of eutectics”, Acta Materialia, 46: 3203-3210, 1998.
Y. A. Chang, H. Cao, D. Ma, L. Ding, K. C. Hsieh, “Zr-rich bulk metallic glass alloys”, US7368023B2, 2008.
Spallation Neutron Source
Advanced Photon Source
Neutron and synchrotron x-ray diffraction