徐祖耀文選(續)（簡體書）

承襲前集《徐祖耀文選》，《徐祖耀文選（續）》這本書系統精選徐祖耀近10年來在材料科學領域發表的68篇英文學術論文，集中反映其在馬氏體與貝氏體相變、超高強度結構鋼、納米材料的結構穩定性與相變機制、形狀記憶材料等方面的進一步探索及創新性成果，以為同仁提供寶貴的借鑒。
《徐祖耀文選（續）》可供從事材料科學、金屬學、固體物理、機械等方向的研究人員及相關專業的高校師生參考。

Foreword
序
1 Martensitic and bainitic transformations
2 Ultrahigh strength steels and related Microstructural Contron
3 Structual Stability and Phase Transformation in Nano-Sized Materials
4 Shape Memory Materials and Shape Memory Effect
5 Characterization of Microstructure Related to Magnetic Property
6 Appendix

1.Introduction
It is well known that theγ→ε transformation in Fe-Mn-Si based shape memory alloys is associated with stacking faults (SF)， while the stacking fault tetrahedron(SFT) plays an important role in the SF initiation [1，2].The stacking faults have been extensively investigated on various aspects， such as the thermodynamic calculation of SF energy [3，4]， the XRD measurement of SF probability (Psf) [5] and the CTEM and HRTEM observations of SF and SFT [6，7]. However， only little work was done on their symmetry characteristics till now. On the other hand， their momechanical training as an effective method to improve the shape memory effect (SME) may lead to formation of transition phases of which some have been examined by internal friction experiment in Fe-26.4Mn-6.0Si-5.2Cralloy [8] and characterized by TEM in Fe-30Mn-6Si alloy [9]， but the others are still not identified. The group theory will be used to describe the symmetry characteristics of　the SF and SFT， to predict the possible transition phases in Fe Mn-Si based alloys and to evaluate their stabilities based on thermodynamic consideration.

2.Symmetry of planar stacking faults
Stacking fault as a kind of planar defects is not a simple plane， but actually is a three-dimensional-structured plane with two-dimensional period. Because of its very low SFE (several mJ/m2) and， thus， its rather wide extension in Fe-Mn-Si based alloys， the stacking fault belongs to this kind of specific plane. Therefore， the layer group in symmetry groups can be suitably used for studying the symmetry characteristics of such stacking faults.

2.1.Layer group
Crystal symmetry group includes point group， plane group， layer group and space group besides staff group， color group and so on. Among them， layer group describes the symmetry group of two-plane objects with double-layer structure which is different from two-dimensional plane group. For the two-dimension situation， 17 kinds of plane groups can be deduced by means of operations including rotation transformation (one- to six-fold axes except the five-fold one)， reflected plane (m) and translation. When a single plane changes into double， an inversion center (i) and a rotating inversion as new operations lead to 80 kinds of layer groups with the definition of space group on the basis of plane group. All these layer groups attributing to four crystal systems (rectangle， rhemble， tetragonal and hexagonal)
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