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您的检索式：作者名="W.E.STUMPF"
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| 1 | Application of shortened heat treatment cycles on A356 automotive brake calipers with respective globular and dendritic microstructures显示文摘Since the automotive industry has many possible applications for semi-solid metal (SSM)-high-pressure die casting (HPDC) parts, the newly developed heat treatment cycles, as well as the traditional heat treatment cycles, were applied to A356 brake calipers cast using a LK DCC630 HPDC machine.Vickers hardness measurements at a cross section of the brake calipers were performed, indicating that similar values can be obtained when using the significantly shorter heat treatment cycles.Finally, the typical tensile properties that can be obtained for SSM-HPDC A356 brake calipers are compared with those manufactured by gravity die casting.Results indicate that the differences in microstructures (globular or dendritic) do not have a noteworthy effect on the heat treatment response.This implies that the short heat treatment cycles originally developed for globular SSM-HPDC A356 castings can be successfully applied to dendritic liquid A356 castings too. | H.MLLER G.GOVEN DER W.E.STUMPF | 2010 | Transactions of Nonferrous Metals Society of China2010，20，9： | 3 |
| 2 | Influence of elevated Fe,Ni and Cr levels on tensile properties of SSM-HPDC Al-Si-Mg alloy F357显示文摘The microstructures and tensile properties of semi-solid metal high pressure die cast(SSM-HPDC) F357 alloys with low and high levels of Fe,Ni and Cr were compared in different temper conditions.ThermoCalc software was used to predict the different intermetallics that can be expected in the alloys,and scanning electron microscopy(SEM) with energy dispersive spectroscopy(EDS) was used to investigate the actual intermetallics that formed.The influence of these intermetallics on tensile properties was quantified.The results show that lower strength is obtained in the alloy with high Fe,Ni and Cr levels.This is attributed mainly to the formation of more π-Al8FeMg3Si6 phase,which removes strengthening Mg atoms from solid solution.Also,the ductility of the high Fe,Ni and Cr levels alloy is decreased significantly due to microcracking of the higher volume fraction π-Al8FeMg3Si6 and Al9FeNi phases.The combination of lower strength and ductility results in a decrease of the quality index of this alloy compared with the alloy with low levels of Fe,Ni and Cr. | H.MLLER W.E.STUMPF P.C.PISTORIUS | 2010 | 中国有色金属学会会刊:英文版2010，20，S3： | 2 |
| 3 | Ti6Al4V合金等温压缩时的扩散相变(英文)显示文摘利用Compu ThermPandat^TM软件及其自带的Ti数据库完成对双相Ti合金的热力学计算。对Ti6Al4V(5级)合金进行等温压缩,合金的初始组织为由层片状的(α+β)和β相组成的层片团结构。采用X射线衍射分析、扫描电镜和透射电镜表征材料的显微组织演化和相转变。用吉布斯自由能-温度和相含量-温度关系图预Ti3Al或α2 (hcp)相的存在、稳定性和相变温度。等温压缩后,(α+β)相区的特征为α/β片层的重新定向和局部扭曲以及在α/β界面区的开裂。而在α→β相变区,β相和α/β相界发生变形,大量的α相转变为β相,板条状α相发生马氏体相变和球化。在β相区,α相完全转变为β单相。结果表明,变形Ti6Al4V合金中形成Ti3Al或α2(hcp)、β(bcc)和α(hcp)相以及密排六方α’和斜方α’’相。变形温度对屈服应力水平、动态回复和动态球化均存在影响。 | K.MUTOMBO C. SIYASIYA W.E.STUMPF | 2019 | Transactions of Nonferrous Metals Society of China2019，29，10： | 1 |
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