A high-pressure-torsion apparatus, comprising: a working axis; a first anvil; a second anvil, facing the first anvil and spaced apart from the first anvil along the working axis, and wherein: the first anvil and the second anvil are translatable relative to each other along the working axis, and the first anvil and the second anvil are rotatable relative to each other about the working axis; and an annular body, comprising: a first conductive chiller, which is: translatable between the first anvil and the second anvil along the working axis; configured to be thermally conductively coupled with a workpiece that has a surface and a central axis, collinear with the working axis; and configured to selectively cool the workpiece; a second conductive chiller, which is: translatable between the first anvil and the second anvil along the working axis; configured to be thermally conductively coupled with the workpiece; and configured to selectively cool the workpiece; and a heater, which is: positioned between the first conductive chiller and the second conductive chiller along the working axis, translatable between the first anvil and the second anvil along the working axis, and configured to selectively heat the workpiece. a working axis; a first anvil; a second anvil, facing the first anvil and spaced apart from the first anvil along the working axis, and wherein: the first anvil and the second anvil are translatable relative to each other along the working axis, and the first anvil and the second anvil are rotatable relative to each other about the working axis; and the first anvil and the second anvil are translatable relative to each other along the working axis, and the first anvil and the second anvil are rotatable relative to each other about the working axis; and an annular body, comprising: a first conductive chiller, which is: translatable between the first anvil and the second anvil along the working axis; configured to be thermally conductively coupled with a workpiece that has a surface and a central axis, collinear with the working axis; and configured to selectively cool the workpiece; a second conductive chiller, which is: translatable between the first anvil and the second anvil along the working axis; configured to be thermally conductively coupled with the workpiece; and configured to selectively cool the workpiece; and a heater, which is: positioned between the first conductive chiller and the second conductive chiller along the working axis, translatable between the first anvil and the second anvil along the working axis, and configured to selectively heat the workpiece. a first conductive chiller, which is: translatable between the first anvil and the second anvil along the working axis; configured to be thermally conductively coupled with a workpiece that has a surface and a central axis, collinear with the working axis; and configured to selectively cool the workpiece; translatable between the first anvil and the second anvil along the working axis; configured to be thermally conductively coupled with a workpiece that has a surface and a central axis, collinear with the working axis; and configured to selectively cool the workpiece; a second conductive chiller, which is: translatable between the first anvil and the second anvil along the working axis; configured to be thermally conductively coupled with the workpiece; and configured to selectively cool the workpiece; and translatable between the first anvil and the second anvil along the working axis; configured to be thermally conductively coupled with the workpiece; and configured to selectively cool the workpiece; and a heater, which is: positioned between the first conductive chiller and the second conductive chiller along the working axis, translatable between the first anvil and the second anvil along the working axis, and configured to selectively heat the workpiece. positioned between the first conductive chiller and the second conductive chiller along the working axis, translatable between the first anvil and the second anvil along the working axis, and configured to selectively heat the workpiece.