precipitation heat

The results show that trace Cr can enhance Cu Zn alloy hardness and recrystallized temperature in the way of precipitation hardening. Rapid heat rolling and quenching can hold the effects of working hardening, and thermomechanical treatment can develop structure hardening as well.

结果表明：微量Cr能提高Cu Zn合金硬度和再结晶温度，Cr对合金性能的影响是通过沉淀强化来实现的，快速热轧淬火具有保留加工强化的效果，形变热处理还产生了组织强化。

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The experimental results show that by combining rare earth modification with heat treatment the eutectic carbide network changes into carbide piece and precipitation of granular carbide are accelerated as a result deferring crack forming time and reduce crack propagation speed and increase the impact fatigue resistance effectively.

结果表明：稀土与热处理复合作用，可加速网状共晶碳化物向孤立块状的转变，促进粒状碳化物的析出，有效地推迟裂纹产生的时间，降低裂纹扩展速率，提高其冲击疲劳抗力。

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The nano TiO2 powder has been made by water-heat reacting precipitation process. The determination of diameter. Phase analysis and the observation of form and face of TiO2 powder have been made by x-ray diffractometer and TEM.

采用水热反应沉淀法制备纳米TiO2粉体，并用X射线衍射，TEM对其进行粒径测定、物相分析和形貌观察。

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