自1971年由美國麻省理工學院Flemings及Spencer發現金屬合金處於半固態時的行為後，同年，兩種半固態成型製程技術也先後問世，包括流變鑄造與觸變鑄造，前者是藉由一面攪拌液態金屬一面冷卻的方式得到等軸晶組織，接著將製備好的熔漿進行壓鑄或送入模具成型，後者是將等軸晶之棒材或鑄錠加熱至固液相共存區，後續再進行半固態成型。
本研究以半固態製程探討鑄造、噴覆成型及擠型製程之AZ91D鎂合金的變形行為，在半固態粗化行為的研究方面，則以修正後的LSW理論方程式 探討料晶粒尺寸之變化，最後再以萬能試驗機進行半固態實驗，探討不同溫度、不同衝桿速率對荷重與材料顯微組織之影響。

The study on the behavior of metals and alloys in the semi-solid state was discovered by Flemings and Spencer in MIT in 1971. In the same year, two kinds of semi-solid forming process were presented, including of rheocasting and thixocasting. The rheo-route involves the preparation of a SSM slurry from liquid alloys and transferring the prepared slurry directly to a die or mould for component shaping. The thixo-route involves the preparation of roll materials or ingot with equiaxed microstructure and reheating the solid feedstock material to semisolid temperature, then shaping the semisolid slurry to component.
In this research, the semisolid forming process was employed to study the deformation behavior of as-cast、spray-formed and extruded AZ91D Mg alloys. In the study of coarsening behavior of material, the modified LSW equation was used to discuss the variation of grain size of material. Finally, to make use of Shimadzu Universal Test Machine, the semisolid forming test was used to study the effects of temperatures and ram speeds on the deformation loads and microstructures.

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