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  1. Effects of Solution Treatment on the Microstructure and Mechanical Properties of Ti–22Al–25Nb Alloys

    Yang Wu, Hongchao Kou, Bin Tang, Degui Liu, Jizhen Li and Jinshan Li

    Version of Record online: 30 MAR 2017 | DOI: 10.1002/adem.201700081

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    For Ti–22Al–25Nb alloy, α2 phase dissolves gradually and the average grain size of B2 phase increases with increasing solution temperature and time. The pinning of some α2 particles at the B2 grain boundaries results in abnormal grain growth (AGG). Furthermore, various microstructure characteristics have significant influence on room temperature tensile properties.

  2. Alloying Effects on the Phase Transformation Behaviors of the Orthorhombic and Ordered ω Phases in High NbTiAl Alloys

    Xingguo Hu, Jinshan Li, Lin Song, Tiebang Zhang and Hongchao Kou

    Version of Record online: 30 MAR 2017 | DOI: 10.1002/adem.201700040

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    Alloying effects of Mn, Mo, and Cr on the phase transformation behaviors of the orthorhombic and ordered ω phases are investigated. Mn and Mo cannot suppress the formation of the orthorhombic phase. Only in the 2Mn alloy are the ordered ω phases observed. The stabilization effect on the βo phase is concluded to be a thermodynamic effect.

  3. Effect of Severe Plastic Deformation and Subsequent Silicon Spheroidizing Treatment on the Microstructure and Mechanical Properties of an Al–Si–Mg Alloy

    Nima Haghdadi, Abbas Zarei-Hanzaki, Megumi Kawasaki, Andre B. Phillion and Peter D. Hodgson

    Version of Record online: 28 MAR 2017 | DOI: 10.1002/adem.201700064

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    In order to make a compromise between strength and ductility, a subsequent heat treatment is carried out on a severely deformed A356 alloy. Heat treatment for 2 min at 540 °C changes the fracture mode from brittle to ductile, makes cracks to propagate intragranularly, and, in turn, enhances the ductility of the material from ≈8% to ≈15%.

  4. Polymer Derived Ceramics with β-Eucryptite Fillers: Filler-Matrix Interactions

    Anna Fedorova, Ulf Betke and Michael Scheffler

    Version of Record online: 24 MAR 2017 | DOI: 10.1002/adem.201700079

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    The phase composition and microstructure of Si–O–C/β-eucryptite composites exhibiting a zero-expansion behavior is evaluated using p-XRD and SEM-EDX. The β-eucryptite filler consumes silica from the Si–O–C matrix above 1 000 °C and finally transforms into a new β-spodumene phase.

  5. Evaluation of Textural Effect on the Rollability of AZ31 Alloys by Wedge-Shaped Sample Design

    Renlong Xin, Maoyin Wang, Zhe Liu, Xingpin Chen, Guangjie Huang and Qing Liu

    Version of Record online: 24 MAR 2017 | DOI: 10.1002/adem.201700035

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    Wedge-shaped AZ31 alloy plates with two kinds of initial textures are designed and rolled at five different temperatures. Then, the rollability under different conditions can be evaluated by observing the development of edge-cracks. It shows that the initial texture has little influence on the single-pass rollability at low temperatures, while the influence was significant for rolling above 150 °C.

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